Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Consider the following relations for emf of a electrochemical cell (1) emf of cell=(Oxidation potential of anode)-(Reduction potential of cathode) (2) emf of cell=(Oxidation potential of anode)+(Reduction potential of cathode) (3) emf of cell=(Reduction potential of anode)-(Reduction potential of cathode). (4) emf of cell=(Oxidation potential of anode)-(Oxidation potential of cathode) Which of the above relations are correct

Answer»

3 and 1
1 and 2
3 and 4
2 and 4

Solution :`E_(cell)=E_("cathode (red)")^(0)-E_("anode (Red)")^(0)` or `E_(cell)=E_("cathode (red)")-E_("anode (OXID)")^(0)`
or `C_(cell)=E_("anode (oxid)")^(0)-E_("cathode (oxid)")^(0)`
Discussion
2.

Consider the following reduction processes : Zn^(2+)+2e^(-)toZn(s), E^(o)=-0.76 V Ca^(2+)+2e^(-)toCa(s),E^(o)=-2.87 V Mg^(2+)+2e^(-)toMg(s),E^(o)=-2.36 V Ni^(2+)+2e^(-)toNi(s), E^(o)=-0.25 V The reducing power of the metals increases in the order :

Answer»

`Ca LT ZN lt MG lt Ni`
`Ni lt Zn lt Mg lt Ca`
`Zn lt Mg ltNi lt Ca`
`Ca lt Mg lt Zn lt Ni`

ANSWER :B
Discussion
3.

Consider the following reduction processes : (I) Fe_2O_3 + Crarr Fe (II) Al_2O_3 + Crarr Al (III) Pbo + C rarr Pb (IV) Ca_3(PO_4)_2 + C + SiO_2 rarr P The correct processe(s) is/ are

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(I) and (III)
(I), (III) and (IV)
(II) and (III)
(I) and (IV)

ANSWER :B
Discussion
4.

Consider the following redox reaction occurring in acidic medium : The unknown standard reduction potential is :

Answer»

`-1.6V`
`1.6V`
`-1.52V`
`1.52V`

SOLUTION :In ACIDIC MEDIUM `(4.3+2.2)/(2)=3.25`
Discussion
5.

Consider the following redox reaction: 2lrCl_(6)^(3-)+3HCOOHto2lr+3CO_(2)+12Cl^(-)+6H^(+) Given: CO_(2)+2H_(3)O^(+)+2etoHCOOH+2H_(2)O""E^(@)=-0.20V lrCl_(6)^(3-)+3etolr+6Cl^(-)""E^(@)=0.77V (a). Determine standard state emf of cell. (b). Is this reaction thermodynamically spontaneous as written? Briefly explain.

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SOLUTION :N
Discussion
6.

Consider the following reactions: Zn(s)+cu^(2+)(aq)rarrZn^(2+) (aq)+Cu(s) With reference to the above reaction which one of the following is correct statement:

Answer»

Zn is REDUCE to `Zn^(2+)`
Zn is oxidised to` Zn^(2+)` IONS
`Zn^(2+)` ions are oxidised to Zn
`CU^(2+)`ions are oxidised to cu

Answer :B
Discussion
7.

Consider the following reactions :Which of these reactions will not produce Saytzeff product ?

Answer»

`(CH_(3))_(3)C CH(OH)CH_(3)overset("CONC."H_(2)SO_(4))RARR`
`(CH_(3))_(2)CHCH(Br)CH_(3)overset(" Alc. KOH ")rarr`
`(CH_(3))_(2)CHCH(Br)CH_(3)overset((CH_(3))_(3)CO^(-)K^(+))rarr`
`(CH_(3))_(2)-UNDERSET("OH ")underset("| ")("C ")-CH_(2)-CHO overset(DELTA)rarr`

Solution :
Discussion
8.

Consider the following reactions underset(2)(Xe)+underset(1)(F_2)overset(Ni)to A underset(1)(Xe)+underset(20)(F_2)to B underset(1)(Xe)+underset(5)(F_2)to C Select incorrect statements:

Answer»

(A) A, B and C all are non-polar and planner molecule
(B) B has no lone pair of electrons
(C) The order of Xe-F bond LENGTH is A gt C gt B
A,B, C are ACT as LEWIS base.

Answer :A::B
Discussion
9.

Consider the following reactions to answer the next question: If product X is treated with AlCl_(3), it undergoes Friedel-Crafts reaction. The expected product is

Answer»




SOLUTION :NA
Discussion
10.

Consider the following reactions to answer the next three questions Q. If product X is treated with AlCl_(3) it undergoes friedel-crafts reaction. The expected product is

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ANSWER :A
Discussion
11.

Consider the following reactions of complex compounds A,B and C (i) ClCl_(2)Br*5NH_(3) +excess" "Ag^(+)(aq)to1AgCl(s) (ii) underset("Compound B")(CoCl_(2)Br*5NH_(3))+"excess "Ag^(+)(aq) to 2AgCl(s) (iii) underset("Compound C")(CoCl_(2)Br*4NH_3)+"excess "Ag^(+)(aq.) to 1AgCl(s) Then according to the given information the correct statement(s) is/are:

Answer»

Compounds(A) and (B) are ionisation isomers
Molar conductivity of compounds (A) and (B) are almost same
Compounds (A), (B) and (C) do not exhibit geometrical isomerism
Order of CFSE values, `Delta_(0)(A) gt Delta_(0)(B) gt Delta_(0)(C)`

SOLUTION :A:`[CoCl(NH_(3))_(5)]*BrCl`
`B:[CoBr(NH_(3))_(5)]*Cl_(2)`
`C:[CoBrCl(NH_(3))_(4)]*CL`
Discussion
12.

Consider the following reactions: Reaction I: underset((1.0" mole"))(CH_(3)-overset(O)overset(||)(C)-CH_(3)) underset("aqueous NaOH")overset(Br_(2)(1.0" mole"))to Reaction II: CH_(3)-overset(O)overset(||)(C)-CH_(3) underset(CH_(3)COOH)overset(Br_(2)("1.0 mole"))to (a) Discuss briefly the composition of the reaction mixture in each case. (b) Discuss the mechanism of the reaction under basic conditions.

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Solution :(b) Step 1. In presence of a base, the three weakly ACIDIC `alpha`-hydrogens of ACETONE are successively replaced by Br atoms to form `alpha, alpha, alpha`-tribromoacetone (I).

Step 2. The `alpha, alpha, alpha`-tribromocetone (I) thus formed undergoes nucleophilic attack by `OH^(-)` ion on the C=O group followed by cleavage of the `C-CBr_(3)` bond and proton to ultimately give bromoform (II) and `CH_(3)COO^(-)` ion.
Discussion
13.

Consider the following reactions of water : (i) 2H_(2)O + Ca to Ca^(2+) + 2OH^(-) + H_(2) (ii) Mg^(2+) + 6H_(2)O to [Mg(OH)_(6)]^(2+) (iii) 2H_(2)O + 2F_(3) to 4HF+ O_(2) The role of a water in a reaction (i), (ii) and (iii) are...............

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OXIDANT, BASE and REDUCTANT
ACID, base and oxidant.
base, reductant and oxidant
reductant, acid and base.

Answer :A
Discussion
14.

Consider the following reactions in which all the reactants and the products are in gaseous state None 2PQhArrP_(2)+Q_(2),""K_(1)=2.5xx10^(5) PQ+1//2R_(2)hArrPQR,""K_(2)=5xx10^(-3) The value of K_(1) for the equlibrium 1//2P_(2)+1//2Q_(2)+1//2R_(2)hArrPQR, is

Answer»

<P>`2.5xx10^(-3)`
`2.5xx10^(3)`
`1.0xx10^(-5)`
`5xx10^(3)`

Solution :Given,`2PQhArrP_(2)+Q_(2)`
`K_(1)=([P_(2)][Q_(2)])/([PQ]^(2))=2.5xx10^(5)`
`PQ+1//2R_(2)hArrPQR.`
`K_(2)=([PQR])/([PQ][R_(2)]^(1//2))=5xx10^(-3)`
Required equlibrium is:
`1//2P_(2)+1//2Q_(2)+1//2R_(2)hArrPQR,`
`K_(3)=([PQR])/([P_(2)]^(1//2)[Q_(2)]^(1//2)[R_(2)]^(1//2))`
`K_(3)=K_(2)xxsqrt((1)/(K_(1)))`
`=5xx10^(-3)xxsqrt((1)/(2.5xx10^(5)))=(5xx10^(-3))/(0.5xx10^(3))=1XX10^(-5)`
Discussion
15.

Consider the following reactions sequence Propan- 1-oloverset(SOCl_2)(to)Xoverset(alc.KOH)underset(Delta)(to)Yoverset((i)B_2H_6//THF)underset((ii)H_2O_2//NaOH)(to) Z (Major) Product Z is

Answer»

`CH_3CH_2COOH`
`CH_3CH_2CH_2OH`
`CH_3CH_2OCH_3`
`CH_3CH(OH)CH_3`

SOLUTION :Hydroboration oxidation is USED for hydration of alkane by ANTI markovnikov rule.
Discussion
16.

Consider the following reactions : I : II. (CH_(3))_(2)underset(OH)underset(|)C-CH_(2)-CHOoverset(Delta)rarr III. (CH_3)_(2)CHCH_(2)-underset(F)underset(|)(CH)-CH_(3)overset(CH_(3)O^(-)Na^(+))underset(Delta)rarr IV. (CH_3)_(2)CH-underset(Br)underset(|)CH-CH_(3)overset((CH_3)_(3)CO^(-)K^(+))rarr Which of these reaction(s) will not produce Hoffmann product ?

Answer»

I and II
I only
II only
II and III

Solution :
II. `(CH_(3))_(2)underset(OH)underset(|)C-CH_(2)-CHO underset("Elcb")overset(Delta)to underset(("SAYTZEFF ELIMINATION"))((CH_(3))_(2)C=CH-CHO)`
III. `(CH_(3))_(2)CHCH_(2)-underset(F)underset(|)CH-CH_(3)underset(Delta)overset(CH_(3)O^(-)Na^(+))to underset(("Hoffmann elimination"))((CH_(3))_(2)CHCH_(2)-CH=CH_(2))`
IV. `(CH_(3))_(2)CH-underset(Br)underset(|)CH-CH_(3)overset((CH_(3))_(3)CO^(-)K^(+))to underset(("Hoffmann elimination"))((CH_(3))_(2)CH-CH=CH_(2))`
Discussion
17.

Consider the following reactions: I. C_(2)H_(5) - I + NH_(3) rarr C_(2) H_(5) N^(o+)H_(3) + I^(o-) II. C_(2)H_(5) - I + ddot(P)H_(3) rarr C_(2)H_(5) P^(o+)H_(5) + I^(o-) III. C_(2)H_(5) - I + EtO^(o-) rarr C_(2) H_(5) - Oet + I^(o-) IV. Me - overset(o+)(S) - Me_(2) + O^(o-)H rarr Me-OH + Me_(2)S In which of the above reactionsdoes not the rate of SN^(2) reactions increasesin solvent polarity?

Answer»

`(I)`
`(II)`
`(III)`
`(IV)`

Solution :If the recatant and/or nucleophilic are changed, INCREASING the polarity of the SOLVENT stablises any charged ground state speicesand decreases the RATE of `SN^(2)` reaction with an increase with the increases in polaityof the solvent.
Discussion
18.

Consider the following reactions I. H_(3)C CI_(3) overset(OH^(Theta))rarr II. H_(3)C CHO overset([Ag(NH_(3))_(2)]^(+)OH^(Theta))rarr III. H_(3)C CO_(2)C(2)H_(5) overset(OH^(Theta))rarr Carboxylic acid is the final product only in the reduction (s)

Answer»

I,II
II,III
II
III

Solution :`UNDERSET(("Tollen's reagent"))(CH_(3)CHO+2[Ag(NH_(3))_(2)^(+)])+3OH^(-)rarrCH_(3)COO^(-)+2Ag+4NH_(3)+2H_(2)O`
`H_(3)C CO_(2)C_(2)H_(5)overset(OH^(-))rarrH_(3)C COO^(-)+underset(("BASIC HYDROLYSIS of ester"))(C_(2)H_(5)OH)`
Discussion
19.

Consider the following reactions: (i) (1)/(2)N_(2)(g)+(1)/(2)O_(2)(g) to NO(g),Delta_(r)H^(ө)=90" kJ "mol^(-1) (ii) NO(g)+(1)/(2)O_(2)(g) to NO_(2)(g),Delta_(r)H^(ө)=-74" kJ "mol^(-1) Select the correct statement about the given reaction.

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In (i) reaction, `NO(g)` is UNSTABLE because the ENERGY is released. The energy is released in (ii) reaction, `NO_(2)(g)` is stable. Unstable NO(g) changes into the stable `NO_(2)(g)`
The energy is absorbed in (i) reaction, NO(g) is unstable. As energy is released in the (ii) reaction `NO_(2)(g)` is stable. That's why unstable NO(g) changes into the stable `NO_(2)(g)`
Both (a) and (B)
NONE of these

Solution :In reactionn (i) enerrgy is absorbed hence, NO becomes unstable so in reaction (ii) it transform to `NO_(2)` by releasing energy.
Discussion
20.

Consider the following reactions H_(3)C-underset(D)underset(|)(C)H-underset(CH_(3))underset(|)(C)H-CH_(3)+overset(*)(B)r to 'X'+HB r Identify the structure of the major product 'X'

Answer»

`H_(3)C-underset(D)underset(|)(C)H-underset(CH_(3))underset(|)(C)H-OVERSET(*)(C)H_(2)`
`H_(3)C-underset(D)underset(|)(C)H-underset(CH_(3))underset(|)overset(*)(C)-CH_(3)`
`H_(3)C-underset(D)underset(|)overset(*)(C)-underset(CH_(3))underset(|)(C)H-CH_(3)`
`H_(3)C-overset(*)(C)H-underset(CH_(3))underset(|)(C)H-CH_(3)`

Answer :B
Discussion
21.

Consider the following reactions, Ethanol overset(PBr_3)to X overset"alc. KOH"to Y underset((ii) H_2O , "heat")overset((i) H_2SO_4 , "room temperature") to Z,product Z is

Answer»

`CH_2=CH_2`
`CH_3CH_2-O-CH_2CH_3`
`CH_3-CH_2-O-SO_3H`
`CH_3CH_2OH`

Solution :`underset"ETHANOL"(CH_3CH_2OH)overset(PBr_3)to underset"(X)"(CH_3CH_2Br)overset"alc. KOH"to`
`underset"(Y)"(CH_2=CH_2) underset((i)H_2O, "HEAT")overset((i)H_2SO_4)to underset"(Z)"(CH_3CH_2OH)`
Discussion
22.

Consider the following reactions at 1000^(@)C (I) Zn(s)+1//2O_(2)(g)overset(Delta)to ZnO(g), Delta G^(@)= -360 " kJ mol"^(-1) (II) C(s)+1//2O_(2)(g) overset(Delta)to CO(g), Delta G^(@) = -460 " kJ mol"^(-1) and choose the correct statement at 1000^(@)C

Answer»

ZNO is more stable than CO
ZnO can be reduced to ZN by C
ZnO and CO are FORMED at equal rate
ZnO can not be reduced to Zn by C

Solution :From given reaction, Free energy of the reaction : `ZnO(g)+C(s) underset(1000^(@)C)overset(Delta)to Zn(g)+CO(g)`, is negative.
Discussion
23.

Consider the following reactions at 1000^@C : (a) Zn(s) +1/2O_2(g) rarr ZnO (s) ,DeltaG^@=-360kJ mol^(-1) (b) C (g) +1/2O_2(g) rarr CO(g),DeltaG^@=-460 " kJ mol"^(-1) Choose the correct statement at 1000^@C :

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Zinc can be oxidised by CARBON monoxide
Zine oxide can be REDUCED by GRAPHITE
Both statement (a) and (B) are true
Both statement (a) and (b) are FALSE

Answer :B
Discussion
24.

Consider the following reactions at 1000^@C (A) Zn_((s)) + 1/2O_(2(s)) to ZnO_((s)) DeltaG^(@) = -360 kJ mol^(-) (B) C("graphite")+ 1/2 O_(2(g)) to CO_((g)) DeltaG^@, = -460 J mol^(-1)

Answer»

Zinc can be oxidised by CARBON monoxide. 
Zinc OXIDE can be REDUCED by graphite.
Both statement (A) and (B) are true. 
Both statement (A) and (B) are FALSE. 

Answer :B
Discussion
25.

Consider the following reactions, A+B underset(k_(-1))overset(k_1)hArr C, C + B overset(k_2)to D The rate in terms of -(d[B])/(dt) will be

Answer»

`k_1[A][B]-k_(-1)[C]`
`k_1[A][B]-k_1[C]-k_2[C][B]`
`k_1[A][B]-k_2[C][B]`
`k_1[A][B]-k_(-1) [C]+k_2 [C][B]`

Solution :From `1^(st)` reaction.
`-(d[B])/(dt)=k_1[A][B]-k_(-1)[C]`
From `2^(ND)` reaction, `-(d[B])/(dt)=k_2[C][B]`
`therefore` TOTAL `-(d[B])/(dt)=k_1[A][B]-k_(-1)[C]+k_2[C][B]`
Discussion
26.

Consider the following reactions

Answer»

Both X and Y are soame and are 1-methoxy-2-methylpropan-2-ol
Both X and Y are soame and are 2-methoxy-2-methylpropan-1-ol
X is 1-methoxy-2-methylpropan-2ol and Y is 2-methoxy-2-methylpropan-1-ol
X is 2-methoxy-2-methylpropan-2-methylpropan-1-ol and Y is 1-methoxy-2-methylpropan-2-ol

SOLUTION :NA
Discussion
27.

Consider the following reactions 1^(@)R-X+Nu^(-) to R-Nu+x^(-) The rateof reaction maximum in the case of

Answer»

Solvent `=H_(2)O,X=I`
Solvent `=C Cl_(4),X=Cl`
Solvent `=H_(2)O,X=Cl`
Solvent `=C Cl_(4),X=I`

SOLUTION :Rate ofreactions is maximum when solvent is nonpolar like `CHCl_(3)C Cl_(4)` etc. and nucleophile is best leaving. `I^(-)` is best leaving nucleophile.
Discussion
28.

Consider the following reactions 1 CH_(3)CH_(2)Cl+NH_(3) (alc) to 2 (CH_(3))_(3)CBr+KCN(alc) to 3 CH_(4)CHBrCH_(3)+agCN(alc) to 4 CH_(3)CHBrCH_(3)+KOH(alc) to The most likely productsis these reations would be

Answer»

`CH_(3)CH_(2)NH_(2),(CH_(3))_(3)CNC,(CH_(3))_(2)CHCN,(CH_(3))_(2)CHOH`
`CH_(3)CH_(2)NH_(2),(CH_(3))_(2)=CH_(3),(CH_(3))_(2)CHNCN,CH_(3)CH=CH_(2)`
`CH_(3)CH_(2)NH_(2),(CH_(3))_(3) CNC, CH_(3)CH=CH_(2),(CH_(3))_(2)CHOH`
`CH_(3)CH_(2)NH_(2),(CH_(3))_(3)C CN,(CH_(3))_(2)CH-NC,(CH_(2))_(2)CHOH`

Solution :`CH_(3)CH_(2)Cl+NH_(2)(alc) to CH_(3) CH_(2) NH_(2)`
2 `(CH_(3))_(3) CBr+KCN(alc) to (CH_(3))_(2)C=CH_(2)`
3 `CH_(3)CHBrCH_(3)+AGCN (alg) to (CH_(3))_(2) CHNC`
4. `CH_(3)CHBrCH_(3)KOH (alc) to CH_(3)CH=CH_(2)`
Discussion
29.

Consider the following reactions:

Answer»


ANSWER :D
Discussion
30.

Consider the following reactions.

Answer»

I, II, III & IV
I, III & IV only
I, II & III only
II & IV only

Solution :(IV) MAJOR PRODUCT is
Discussion
31.

Consider the following reactions (1) (CH_3)_3"CC"H(OH)CH_3overset("conc".H_2SO_4)rarr (2) (CH_3)_2"CHCH(Br)CH_(3)overset(conc.KOH)rarr(3) (CH_3)_2"CHCH(Br)CH_(3)overset((CH_3)_3CO^(-) Koplus)rarr (4) (CH_3)_2underset("OH")underset(" |")(C-CH_2)-CHOoverset(Delta)rarrWhich of these reaction(s) will produce Saytzeff product?

Answer»

(1) , (2) and (4)
(3) only
(4) only
(2) and (4)

ANSWER :A
Discussion
32.

Consider the following reaction, Zn+2H^(+)rarrZn^(2+)+H_(2) Half-life period is independent of concentration of Zn at constatn pH. At constant Zn concentration, half-life is 10 minutes at pH = 2 and half-life is 100 minutes at pH = 3. Hence, rate law is :

Answer»

`k[ZN][H^(+)]`
`k[Zn][H^(+)]^(2)`
`k[Zn]^(0)[H^(+)]`
`k[Zn]^(0)[H^(+)]^(2)`

Answer :A
Discussion
33.

Consider the following reaction: zMnO_(4)^(-) + yC_(2)O_(4)^(2-) + zH^(+) rarr xMn^(2+) + 2yCO_(2) + (Z)/(2) H_(2)O The value of x,y and z are:

Answer»

5,2 and 8
5,2 and 16
2,5 and 8
2,5 and 16

Answer :C
Discussion
34.

Consider the following reaction : xMnO_(4)^(-)+yC_(2)O_(4)^(2-)+zH^(+)toxMn^(2+)+2yCO_(2)+(z)/(2)H_(2)OThe values of x,y and z in the reaction are , respectively :

Answer»

5 , 2 and 16
2 , 5 and 8
2 , 5 and 16
5 , 2 and 8.

Solution :`{:(MnO_(4)^(-)+8H^(+)+5e^(-)rarrMn^(2+)+4H_(2)O"]"xx2),(""C_(2)+O_(4)^(2-)rarr2CO_(2)+2e^(-)"]"xx5),(bar(2MnI_(4)^(-)+5C_(2)O_(4)^(2-)+16H^(+)rarr2Mn^(2+)+10CO_(2)+8H_(2)O)):}`
`thereforex=2,y=5andz=16`
Discussion
35.

Consider the following reaction : xAs_(2)S_(3)+yO_(2)to zAs_(2)O_(3)+wSO_(2) What is y (the coefficient for O_(2)) when this equation is balanced using whole number coefficients ?

Answer»

5
7
9
11

Solution :Balancedchemicalequationsis
`2As_(2)S_(3) +9 O_(2) toAs_(2)O_(3) +6SO_(2) .` SOY is 9
Discussion
36.

Consider the following reaction Which of these reactions are possible ?

Answer»

(B), (C) and (d)
(b) and (d)
(a) and (d)
(a) and (b)

ANSWER :B
Discussion
37.

Consider the following reaction The compound X is

Answer»




ANSWER :B
Discussion
38.

Consider the following reaction, The electrophile involved in the above reaction is

Answer»

dichloromethyl cation, `overset(+)(C)HCl_(2)`
formyl cation, `overset(+)(C)HO`
trichloromethyl anion, `bar(C)Cl_(3)`
DICHLOROCARBENE, : `C Cl_(2)`

Solution :`CHCl_(3)+bar(O)H rarr underset(("Unstable"))(bar(C)Cl_(3))+H_(2)O`
`bar(C)Cl_(3)rarr: underset(underset(("electrophile"))("Dichlorocarbene"))(C Cl_(2))+Cl^(-)`
Discussion
39.

Consider the following reaction sequence The compounds S is:

Answer»

Ph-CH=CH-CN
`Ph-CH=CH-undersetunderset(OH)(I)CH-CN`
`Ph-undersetunderset(CN)(|)oversetoverset(OH)(|)C-CH=CH_2`
`Ph-CH_2-CH=CH-undersetunderset(OH)(|)CH-CN`

SOLUTION :
Discussion
40.

Consider the following reaction sequence The compounds P and Q are :

Answer»

`Ph-CH=O+CH_3CH=O`
`Ph-CH_2-CH=O+CH_3-CH=O`
`Ph-CH=O+CH_3-CH_2-CH=O`
`Ph-CH=O+CH_2=O`

ANSWER :A
Discussion
41.

In the following sequence of reactions, the alkene affords the compound B: CH_(3)CH=CHCH_(3)overset(O_(3))rarrAunderset(Zn)overset(H_(2)O)rarrB The compound B is

Answer»

`CH_3CH_2COCH_3`
`CH_3COCH_3`
`CH_3CHO`
`CH_3CH_2CHO`

ANSWER :C
Discussion
42.

Consider the following reaction sequence:

Answer»




ANSWER :A::B::C
Discussion
43.

Consider the following reaction sequence: Choose the most correct of the following ?

Answer»




SOLUTION :
`Runderset((2)H_(2)O_(2)//OH^(-))OVERSET((1)B_(2)H_(6)//THF)rarr`syn addition occurs.
Discussion
44.

Consider the following reaction :s Phenol underset(Zn "dust")to X underset("Anhydrous" AlCl_(3))overset(Ch_(3)Cl)to Y overset("Alkaline " KMnO_(4))to Z. The product Z is

Answer»

Toluene
Benzaldehyde
benzoic acid
Benzene

Solution :
Discussion
45.

Consider the following reaction :s ethanol C_2H_5OHoverset(PBr_(3))(rarr)Xoverset(alc.KOH)(rarr)Yoverset((i)O_3 Zn" ")underset((ii)H_(2)O,heat)(rarr)Z the product Z is

Answer»

`2CO_(2)`
`2HCOOH`
`UNDERSET(CHO)underset(|)CHO`

SOLUTION :`{:(CH_(2)OH),(" |"""overset(HIO_(4))toCH_(2)O+CH_(2)O),(CH_(2)OH):}`
Discussion
46.

Consider the following reaction :s ethonal overset(PBr_(3))to X overset(alc. KOH)to Yunderset((ii)H_(2)O, "heat")overset((i) H_(2)SO_(4) " room temperature")to Z, product Z is

Answer»

`CH_(2)=CH_(2)`
`CH_(3)CH_(2)-O-CH_(2)-CH_(3)`
`CH_(3)-CH_(2)-O-SO_(3)H`
`CH_(3)CH_(2)OH`

SOLUTION :`CH_(3)CH_(2)OH overset(PBr_(3)) to CH_(3)CH_(2)Br overset(ALC. KOH)to CH_(2)=CH_(2)overset((i)H_(2)SO_(4))to CH_(3)-CH_(2)-HSO_(4)underset("heat")overset(H_(2)O)to CH_(3)CH_(2)OH`
Discussion
47.

Consider the following reaction RONa+H_(2)C to ROH+NaOH ROH+NaNH_(2) to RONa+NH_(3) Predict which of the following order reagarding base strength is correct.

Answer»

`OH^(-)LT NH_(2)^(-) lt RO^(-)`
`NH_(2)^(-)lt OH^(-) lt RO\^(-)
`OH^(-)lt RO^(-) lt NH_(2)^(-)
`RO^(-)lt NH_(2)^(-) lt OH^(-)

Solution :`R-overset(-)(Ona^(+)) +H_(2)O to ROH+NaOH`
`ROH+NaNH_(2) to RONa+NH_(3)`
Since the reaction is favoured in forward DIRECTION, `RO^(-)` is stronger BASE than `OH^(-)`. According to the second reaction `NH_(2)^(-)` is stronger than `RO^(-) as NH_(2)^(-) "forms" NH_(3)`. The order of basic strength if `OH^(-) lt RO^(-) lt NH_(2)^(-)` .
Discussion
48.

Consider the following reaction RCOO^(-) Ag^(+) overset(Br_(2))to RBr + AgBr + CO_(2) The given reaction is known as X reaction and proceeds via a Y intermediate 'X' and 'Y' stand respectively for

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Hell-Volhard ZELINSKY, carbanion
Sandmeyer, FREE radical
Wolff-Kishner, carbene
Hunsdiecker, free radical.

Solution :Hunsdiecker reaction OCCURS by a free radical intermediate.
Discussion
49.

Consider the following reaction :R-OH overset(HCl)rarr R-Cl+H_(2)OThe above reaction is not true if R is …….

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`CH_(3)-`
`CH_(3)-CH_(2)-`
`CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C ")-`

Solution :The C - O bond in phenol has a partial double bond character. Thus, aryl halides cannot be PREPARED by this METHOD.
Discussion
50.

Consider the following reactionPhenol overset("zn dust")(to) X underset("anhyd".AlCl_3) overset(CH_3Cl)(to) (Y) underset(KMnO_4) overset("alkaline")(to) ZThe product Z is

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ANSWER :B
Discussion