Explore topic-wise InterviewSolutions in Current Affairs.

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1.

Identify A to E

Answer»

Solution :Gas (B) gives brownppt with `K_(2)HgI_(4)`
`rArr` gas (B) is `NH_(3)`
`rArr (A)` is `NH_(4)^(Theta)`
Gas (C ) turn water MILKY
`rArr (C )` can be `SO_(2)` or `CO_(2)`
Gas (D) is also obtain along with (C ) , gas (D) turnwith blue flame and is fatal when inbaled
`rArr` gas (D) is `CO`
`rArr` gas (C ) is `CO_(2)`
`rArr (A)` has `C_(2)O_(4)^(2+)`
It is condiremed by the fact that `CaCI_(3)` gives ppt `CaC_(3)O_(4)(E )` which decolourises `MnO_(4)^(Theta) H^(Theta)`
`rArr (A)` is `(NH_(6))_(2)C_(2)O_(4)`
Explanation:
`underset((A))((NH_(4))_(2))C_(2)O_(4) overset(Delta)rarr underset((B))(2NH_(3)) + underset((C))(CO_(2)) + underset((D))(CO)+H_(2)O`
(B) is blue towards litmus (basic)
(C) is red towards litmus (acidic)
(D) is neutral
`(NH_(4))C_(2)O_(4) +2NaOH overset(Delta)rarr Na_(2)C_(2)O_(4) + underset((B))(2NH_(3)) + 2H_(2)O`
`Na_(2)C_(2)O_(4) +CaCI_(2) rarr underset("white ppt") (CaC_(2)O_(4)darr) +2NaCI`

`underset("Violet")(2MnO_(4)^(Theta)) 16 H^(o+) +5C_(2)O_(4)^(2-) rarr 10 CO_(2) +underset("Colourless")(2Mn^(2+)) +H_(2)O`
Discussion
2.

Identify A to E

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Solution :(C ) is colourlesssoluble solution
(C ) gives blackppt , with `H_(2)SHCI`
`RARR` (C ) isof group II
(C ) gives yellow ppt , with `KI` as WELL as with `K_(2)CrO_(4) rArr (c )` has `Pb^(2+)`
THUS (C) is `Pb(NO_(3))_(2)` obtained from (A),(B) on HEATINGWITH `Mn^(2+)` and `HNO_(3)` gives purple colour whichis dueto oxidationof `Mn^(2+)`in `HMaO_(4)`(purple)
`rArr`(B)is oxidising agent
`rArr` (B) is `PbO_(2)` (blackish brown )
`rArr`(A) is doubled oxide of lead
(A ) is `Pb_(2)O_(4)` (red lead )`(2PbO.PbO_(2))`
`underset((A))(Pb_(3)O_(4)) + 4HNO_(3) rarr underset((B))(PbO_(2))+ underset((C))(2Pb(NO_(3))_(2)) + 2H_(2)O`
`underset((C))(Pb(NO_(3))_(2)) + 2KI rarr underset("Yellow")(PbI_(2)darr)`
`Pb (NO_(3))_(2) +H_(2)S rarr underset((D)black)(PbCrO_(4)darr)`
`PbO_(2) +Mn^(2+) +HNO_(3) rarr underset((E)"pink")(HMnO_(4)) +Pb^(2+)`
Discussion
3.

Identify (A) to (D) in the following series of reactions : underset(DMF)overset(KCN)rarr(A)underset(C_(6)H_(5)CHO,"heat")overset(C_(2)H_(5)ONa,C_(2)H_(5)OH)rarr(B)underset("heat")overset(H_(3)O^(+))rarr(C)underset((II)CH_(3)NH_(2))overset((I)SOCl_(2))rarr(D)

Answer»


ANSWER :`(##ALN_CHM_C09(II)_E01_957_A01##)`
Discussion
4.

Identify A to D

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Answer :A: `ZN(NO_(3))_(2)` B: `NO_(2)`C : `ZNO` D: `ZNS`
Discussion
5.

Identify A to D

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Answer :A: `FeBr_(3) ` B: `AGBR` C: `Br_(2)` D: `FE(OH)_(3)`
Discussion
6.

Identify A to D

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Answer :A: `AI_(2)(SO_(4))_(3)` B: `AI(OH)_(3)` C: `FeSO_(4)`
D: `CoO.AI_(2)O_(3)`
Discussion
7.

Identify A to Cin the followingsequence ? C_(6) H_(5) NO_(2) overset(Fel) underset(HCI)to Aoverset(HNO_(2)) underset(273K)toB overset(H_(2)O) underset(A)to C

Answer»

Solution :` C_(6)H_(5)NO_(2) overset("Fe/HCI") underset(6(H))tounderset((A) " Aniline" )C_(6)H_(5)NH_(2)`
`underset((A) " Aniline " ) (C_(6)H_(5)NH_(2)) + underset(" Nitrous Acid") (HNO_(2))overset("HCI") underset(273 K) toC_(6)H_(5)N=underset("Benzene DIAZONIUM") (N-CI)`
THe reactionis knownaschloridediazotisation .
Discussion
8.

Identify A to C

Answer»


ANSWER :A: `ZnO` B: `ZnCI_(2)` C: `Na_(2)ZnO_(2)`
Discussion
9.

Identify a species which is 'NOT' a Bronsted acid but a Lewis acid.

Answer»

`BF_(3)`
`H_(3)^(+)O`
`NH_(3)`
HCl

Solution :MOLECULES having a CENTRAL ATOM with incomplete octet, act as a Lewis acid not Bronsted acid (proton donor). In `BF_(3)`, B is having 6 ELECTRONS.
Discussion
10.

Identify a reagent from the folloiwng list which can easily distinguish between 1-butyne and 2-butyne.

Answer»

bromine, `C Cl_(4)`
`H_(2)//Ni`
dilute `KMnO_(4)`
ammonical `Cu_(2)Cl_(2)` solution

Solution :`CH_(3)-CH_(2)-C-=CHunderset(NH_(4)OH)overset(Cu_(2)Cl_(2))rarrunderset("BLOOD red colour")(CH_(3)-CH_(2)-C-=overset(Θ)(C )Coverset(o+)(U))+NH_(4)Cl+H_(2)O`
Discussion
11.

Identify : a. Give the reactants of the following amines obtained by reduction withLAH.

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SOLUTION :` (##KSV_CHM_ORG_P2_C15_E01_001_S01.png" width="80%">
`R rArr CH_(3)-OVERSET(CH_(3))overset(|)(CH)-`
d. Let the ketone be :
`R_(1)-overset(O)overset(||)(C)-R_(2)overset(CH_(3)MgBr)underset(H_(3)O^(o+))rarr R_(2)-overset(OH)overset(|)underset(CH_(3))underset(|)(C)-R_(2)`
`rArr CH_(3)-overset(CH_(3))overset(|)underset(OH)underset(|)(C)-C_(2)H_(5) R_(1) rArr CH_(3-), R_(2) rArr C_(2)H_(5-)`,
` (##KSV_CHM_ORG_P2_C15_E01_001_S02.png" width="80%">
`(C) rArr CH_(3)-overset(C_(2)H_(5))overset(|)(C)=N.OH, (D) rArr CH_(3)-overset(C_(2)H_(5))overset(|)(CH)-NH_(2)`
Discussion
12.

Identify (A) is the following reaction :

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SOLUTION :
Discussion
13.

Identify "A" in the reaction

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SOLUTION :It.s a Clemmensen.s REDUCTION."A" is ` CH_3 - CH_2 - "CH_3 `
Discussion
14.

Identify 'A' in the reaction :

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SOLUTION :
Discussion
15.

Identify A in the following sequence of reactions: Aunderset(1"mole")overset(NH_(3))(rarr)Bunderset("Alc.KOH")overset(CHCI_(3))(rarr)Coverset("Reduction")(rarr)(CH_(3))_(2)CHNHCH_(3)

Answer»

ETHYL halide
Iso-propylamine
n-Propyl halide
Iso-propyl halide

Solution :
Discussion
16.

Identify (A) in the given reactions sequence. (A) overset(O_(3)//H_(2)O)rarr (B) overset(Delta)rarr 2CH_(3)-overset(O)overset(||)(C)-CH_(3)-2CO_(2)

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ANSWER :C
Discussion
17.

Identify A in the following sequence of reactions A overset(NH_(3)) underset("1 mol") to B overset(CHCI_(3)) underset("Alc.KOH")to C overset("Reduction")to (CH_(3))_(2) CHNHCH_(3)

Answer»

ETHYL HALIDE
ISO-propylamine
n-PROPYL halide
Iso- propyl halide

ANSWER :D
Discussion
18.

Identify A in the following reaction, C_(8)H_(8)O" "Aoverset(NaOH//l_(2))to B underset(Delta)overset("Soda lime")toBenzene

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All of these

Answer :B
Discussion
19.

Identify A in the following reaction. A+CH_(3)I rarr CH_(3)-NH-CH_(3)+HI

Answer»

SOLUTION :`A=CH_(3)NH_(2)`.
Discussion
20.

Identify A from the following: (i) C_(6)H_(5)COCH_(3) overset(A)to C_(6)H_(5)COOH+CO_(2)+H_(2)O (ii) C_(6)H_(5)COCH_(3) overset(A)to C_(6)H_(5)-underset(OH)underset(|)overset(H)overset(|)C-C_(6)H_(5) (iii) C_(6)H_(5)COCH_(3) overset(A)to C_(6)H_(5)CH_(2)CH_(3)+H_(2)O

Answer»

SOLUTION :(i) A-Acidified POTASSIUM PERMANGANATE or potassium dichromate.
(ii) A-Sodium and ethanol.
(iii) A-Zinc amalgam and CONC. HCI.
Discussion
21.

Identify (A) based on the following facts: a. (A) redues HgCI_(2) solution to white ppt changing to grey b.(A) turn FeCI_(3) yellow coloured solution to green c. (A) gives while ppt NaOH soluble in excess of NaOH d. (A) gives yellow dirty ppt ,on passing H_(2)S gas in yellow ammoniumsalphide (YAS) e. (A) gives chromyl chloride test

Answer»

Solution :(A) Gives yellow dirtyppt solublein `YAS`
`rArr` (A)has `SN^(2+)`
(A) gives chromyl chloride test (of `CI^(Theta))`
`rArr` (A) has `CI^(Theta)`
`(A)` is `SaCI_(2)`
Explanation:
a. `SnCI_(2)+2HgCI_(2) rarr UNDERSET("white")(Hg_(2)CI_(2)darr)+SnCI_(4)`
`SnCI_(2)+Hg_(2)CI_(2) rarr underset("Grey")(2Hg)+snCI_(4)`
b. `underset("Yellow")(2FeCI_(3)) +SnCI_(2) rarr underset("Green")(2FeCI_(2))+SnCI_(4)`
e. `SnCI_(2) +2NaOH rarr underset("white")(Sn(OH)_(2)darr)+2NaCI`
`Sn(OH)_(2) +2NaOH rarr underset(("sodium stannite"))underset("Soluble")(Na_(2)SnO_(2)+)2H_(2)O`
d. `SnCI_(2)+H_(2)S rarr 2HCI +underset("Yellow")(SnSdar)`
`SnS+underset(YAS)((NH_(4))_(2))S_(2) rarr underset("Soluble")((NH_(4))_(2)SnS_(3))`
Discussion
22.

Identify 'A' in the following reaction : A+2Na overset("Dry")underset("ether")rarr 2,2,5,5-tetramethyllexane+ 2NaBr.

Answer»

2-Bromo-2-methylbutane
1-Bromo-2,2-dimethylpropane
1-Bromo-3-methylbutane
1-Bromo-2-methylpropane

ANSWER :B
Discussion
23.

Identify A, B, C, D, E, R and R^(1) in the following :R-Br+Mg overset(" dry ether ")rarr C overset(D_(2)O)rarr CH_(3)-underset("D")underset("|")("C")H-CH_(3)

Answer»

SOLUTION :
Discussion
24.

Identify A, B, C, D, E, R and R^(1) in the following :

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SOLUTION :
Discussion
25.

Identify A, B, C, D, E, R and R' in the following R-Br + Mg overset("dry ether")rarr C overset(D_(2)O)rarr CH_(3) underset(underset(D)(|))(C )HCH_(3)

Answer»

Solution :
`R: (CH_(3))_(2)OH- , C: (CH_(3))_(2)CHMgBr, R' - (CH_(3))_(3)C-, D : (CH_(3))_(3)C MgBr and E: (CH_(3))_(3)CH`
Discussion
26.

Identify A, B, C, D, E, R and R^(1) in the following :

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SOLUTION :
Discussion
27.

Identify A, B, C, D, E, R and R' in the following:

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SOLUTION :
Discussion
28.

Identify D, E and R' in the following :

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SOLUTION :
Discussion
29.

IdentifyC,in the following :

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SOLUTION :
Discussion
30.

Identify A, B, C, D, and X. When a white crystalline compound X is heated with K_2Cr_2O_7 and concentrated H_2SO_4, a reddish brown gas A is evolved. On passing A into caustic soda solution a yellow coloured solution of B is obtained Neutralising the solution of B with acetic acid and on subsequent addition of lead acetate, a yellow precipitate C is obtained. When X is heated with NaOH solution a colourless gas is evolved and on passing this gas into K_2Hgl_4 solution a reddish brown precipitate D is formed.

Answer»

Solution :`X` is `NH_4Cl`
`4Cl^(ɵ)+K_2Cr_2O_76H_2SO_4tounderset((gas A))(2CrO_2Cl_2+2KHSO_4+4HSO_4^(ɵ)+3H_2O`
`CrO_2Cl_2+4NaOHtounderset((B))(Na_2CrO_4+2NaCl+2H_2O`
`Na_2CrO_4+(CH_3COOH)_2PbtoPbCrO_4+2NaCl+2H_2O`
`NH_4^(o+)+4NaOHoverset(Delta)tounderset((Gas))(NH_3)+NA^(o+)+H_2O`
`NH_3+2[HgI_4]^(2-)+H_2OtoH_2N-Hg-O-Hg-Idarr`
Discussion
31.

Identify A, B, C, D, E, R and R' in the following:

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SOLUTION : 
`R = CH_3CHCH_3, R^1 = H_3C -underset(CH_3)underset(|)overset(CH_3)overset(|)(C), `
`D = H_3C -underset(CH_3)underset(|)overset(CH_3)overset(|)(C )-MgX , E = H_3C -underset(CH_3)underset(|)overset(CH_3)overset(|)(C)-H`
Discussion
32.

Identify (A), (B), (C), (D) and(E), …in the following equations

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SOLUTION :
Discussion
33.

Identify A, B, C, D and write the complete equation.

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SOLUTION :
Discussion
34.

Identify (A), (B), ( C ), (D) and (E) in the following reactions :

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SOLUTION :
Discussion
35.

Identify A, B, C, D

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ANSWER :B
Discussion
36.

Identify A, B, C and D, in the following schemes and write their structures,

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SOLUTION :
Discussion
37.

Identify A, B, C ……. In the following reaction set up. C_(6)H_(7)H underset(HCl(0^(@) - 5^(@)C))overset(NaNO_(2))to A overset(CuCl)to B underset(Na//Me_(2)O)overset(phCH_(2)Cl)to Coverset(NBS) to D------

Answer»

Solution :`C_(6)H_(7)N underset(HCl(0^(@) - 5^(@)C))OVERSET(NaNO_(2))toA`This is Diazotisation reaction , hence `C_(6)H_(7)N` is Aniline.
Discussion
38.

Identify (A), (B) and ( C ) in the followwing:

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SOLUTION :The GIVEN DIKETONE can undergo INTRAMOLECULAR ALDOL condensation to form A.
Discussion
39.

Identify (A), (B), (C ),

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Solution :(A) `implies snCl_(2)//HCl, FeSO_(4)//NH_(4)OH`
(B) `implies NaBH_(4), LAH//AlCl_(3)`
(C ) `implies CrO_(3)//Ac_(2)O`
Discussion
40.

Identify A,B and C in the following reactions CH_(3)Cl overset(KCN) to A underset(H_(3)O^(o+))overset("hydrolysis")toB underset(Delta)overset(C_(2)H_(5)OH//H^(+))toC

Answer»

`{:(A,,B,, C) ,(CH_3NC,, CH_3NHCH_3,,CH_3N(CH_3)C_2H_5):}`
`{:(A,,B,, C) ,(CH_3CN,, CH_3CONH_2,,CH_3CO_2H):}`
`{:(A,,B,, C) ,(CH_3CN,, CH_3CO_2H,,CH_3CO_2C_2H_5):}`
`{:(A,,B,, C) ,(CH_3CN,, CH_3CO_2H,,(CH_3CO)_2O):}`

ANSWER :C
Discussion
41.

Identify A, B and C in the following reaction: CH-=CH underset(HgSO_(4))overset("dil. "H_(2)SO_(4))to A overset("dil. "NaOH)toBoverset("heat")to C

Answer»

Solution :`underset("Acetylene")(CH-=CH) underset(HgSO_(4))overset("dil. "H_(2)SO_(4))to underset((A))underset("Ethanal")(CH_(3)CHO) overset("dil. "NaOH)tounderset((C ))underset("But-2-enal")underset(CH_(3)CH=CHCHO)underset(""darr"HEAT")underset((B))underset("3-Hydroxybutanal")underset(OH)underset(|)("CH"_(3)CHCH_(2)CHO)`
Thus A, B and C are
`A=CH_(3)CHO "" B=CH_(3)underset(OH)underset(|)(CH)CH_(2)CHO""C=CH_(3)CH=CHCHO`
Discussion
42.

Identify A, B and C in above reaction ?

Answer»


Answer :`A rarr ZN, B rarr CH_(3)Cl//FeCl_(3)` and `C rarr` Strong oxidising REAGENT.
Discussion
43.

Identify A, B and C in the following reactions-

Answer»

SODALIME, BENZENE, POTASSIUM phenoxide
Zn,benzene,SODIUM ethoxide
Zn, CYCLOHEXANONE, sodium ethoxide
None of the above.

Answer :A
Discussion
44.

Identify A, B and C from the following reactions. (i) P_(4)+MgrarrA (ii) P_(4)+CararrB (iii) P_(4)+Na rarr C

Answer»

SOLUTION :(i) `P_(4)+6Mg+2Mg_(3)P_(2)" (magnesium phosphide)"`
(II) `P_(4)+6Cararr 2Ca_(3)P_(2)"(Calcuium phosphide)"`
(iii) `P_(4)+12Nararr 2Na_(3)P" (Sodium phosphide)"`
Discussion
45.

Identify (A) and (B) underset("active amine")("An optically") underset("methylation and elimination")overset("Hofmann exhaustive")to underset("B")("Alkene") overset("Ozonolysis")toCH_(3)CH_(2)CH_(2)+CHO+HCHO

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SOLUTION :PROCEED REVERSE to find the structure of (B)
Discussion
46.

Identify (A), (B), and (C ) and give their strucyures.

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SOLUTION :
`BETA`-Keto acid UNDERGOES decrdoxylation (neighbouring group PARTICIPATION).
Discussion
47.

Identify (A) , (B) and (C ) .

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SOLUTION :` (##KSV_CHM_ORG_P2_C15_E01_020_S01.png" WIDTH="80%">.
Discussion
48.

Identify A and B respectively in the following reaction: Br-CH_(2)-CH_(2)-Broverset("Excess ACOAg")to[A]overset("Hydrolysis")to[B]+2ACOH

Answer»

1,2-diacetoxyethane and 1,2-dibromoethane
1,2-diacetoxyethane and ETHYLENE GLYCOL
Ethylene glycol and Glycerol
Ethylene glycol and 1,2-diacetoxyethane

Solution :.
Discussion
49.

Identify A and predict the type of reaction.

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SOLUTION :.

.
Discussion
50.

Identify A and B in the reaction CH_(3)-CH_(2) - CH = CH_(2) underset(200-300^(@)C)underset(or AlCl_(3))overset(500-700 ^(@)C)(to) A + B

Answer»

SOLUTION :`A IMPLIES CH_(3) - CH= CH - CH_(3)B implies (CH_(3))_(2) C = CH_(2)`
Discussion