Explore topic-wise InterviewSolutions in Current Affairs.

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1.

C_4H_6O_4(X)underset((LiAIH_4))overset(LAH)tooverset(HBr)tooverset(NaCN)tooverset(H_3O^(+),CaO,Delta)toYoverset(CaO,Delta)toHexanedioic acid. X and Y are

Answer»




SOLUTION :
Discussion
2.

C_(4)H_(11)N(X)+HNO_(2) to C_(4)H_(10)O(3^(@)"alcohol") hence, (x) will give:

Answer»

Carbylamine reaction
Hofmann's mustard OIL reaction
Diazonium salt (as the intermeidat)
Hofmann's BROMIDE reaction

Answer :A::B::C
Discussion
3.

C_(4)H_(11)N represents

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`1^(0)` amines
`2^(0)` amines
`3^(0)`amines
all of these

ANSWER :D
Discussion
4.

C_(4)H_(10)overset(Cl_(2)hv)rarr underset(("Mono chlorinated products"))(X+Y) The yield of X and Y formed in the above reaction is

Answer»

`50 : 50`
`72 : 28`
`45 : 55`
`60 : 40`

Solution :`72:28`
Discussion
5.

C_(4)H_(10)O underset(H_(2)SO_(4))overset(K_(2)Cr_(2)O_(7))toC_(4)H_(8)O underset("warm")overset(I_(2)//NaOH)to CHI_(3) Here N is

Answer»




Solution :As `C_(4)H_(8)O underset("warm") overset(I_(2)//NAOH) to CHI_(3)`
So `C_(4)H_(8)O` should have `-underset(O)underset(||)C-CH_(3)` group.
`:. C_(4)H_(8)O` can be `CH_(3)CH_(2) - underset(O)underset(||)C-CH_(3)`
so , `C_(4)H_(10)O(N)` should be `CH_(3)CH_(2)underset(OH)underset(|)(CH)CH_(3)`
Discussion
6.

C_(4)H_(10)O has ____metamers. One of them is diethyl ether while the others are_____and_____.

Answer»

SOLUTION :THREE, METHYL n-propyl ETHER, ISOPROPYL methyl ether.
Discussion
7.

C(4)H_(10)O+PCl_(5)rarrR_(1)Cl+R_(2)Cl+POCl_(3) R_(1)Cl gives halogrom test but R_(2)Cl does not, hence, the original compound of the reaction is :

Answer»

ethoxyethane
1-methoxypropane
2-methoxypropane
isobutyl alcohol

Answer :C
Discussion
8.

C_4H_10O+HI overset("Hot")to R_1 - I + R_2 -I R_1-I and R_2-I on alkaline hydrolysis gives alcohols A and B respectively . The compound A and B gives haloform test. The original compound is

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ANSWER :B
Discussion
9.

C_(4)H_(10)O gives white precipitate immediately with conc. HCl in the presence of anhydrous ZnCl_(2). Alcohol can be

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SOLUTION :`3^(@)` alcohol reacts most READILY with conc. HCl forming white PRECIPITATE.
`underset("alcohol")underset("Tertiary")(R_(3)COH)overset("Conc. HCl")underset("Anhy. "ZnCl_(2))rarrunderset("immediately")underset("Turbidity appears")(R_(3)"CCl")+H_(2)O`
Discussion
10.

C_3H_9N represent :

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`1^@` AMINE
`2^@` amine
`3^@` amine
All

Answer :D
Discussion
11.

C_3H_9N represents

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PRIMARY amine
Secondary amine
Tertiary amine
All

Answer :D
Discussion
12.

C_(3)H_(9)N represent

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`1^(0)` AMINE
`2^(0)` amine
`3^(0)` amine
all of these

ANSWER :B
Discussion
13.

C_(3)H_(9)N cannot represent:

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`1^(@)` AMINE
`2^(@)` amine
`3^(@)` amine
quaternary salt.

Answer :D
Discussion
14.

C_3H_9Ncan not represent :

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`1^@` amine
`2^@` amine
`3^@` amine
QUATERNARY SALT

Answer :D
Discussion
15.

C_(3)H_(7)X represents

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`1^(@)AND2^(@)R-X`
`1^(@)AND3^(@)RX`
`2^(@)and3^(@)RX`
only `2^(@)RX`

ANSWER :A
Discussion
16.

C_(3)H_(7)X shows

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OPTICAL ISOMERISM
CHAIN isomers
POSITION isomerism
position isomerism

Answer :C
Discussion
17.

C_(3)H_(7) Cl overset(KOH(alc.))(rarr) (A) underset(770K)overset(Cl_(2) (g))(rarr) (X).(X) can be:

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Vinyl CHLORIDE
Allyl chloride
Ethyl chloride
Ethyl isodide

Solution :`(A) IMPLIES CH_(3) - CH = CH_(2)`
`(X) implies "ALLYLIC chlorination"
`Cl-CH_(2) - CH= CH_(2)`
Allyl chloride
Discussion
18.

C_(3)H_(6)O underset(Delta) overset(OH^(-)) toMesityl oxide . The C_(3)H_(6) O is

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`CH_(3) - CH_(2) - CHO`
`CH_(3) COOH_(3)`
`CH_(2) = CH - CH_(2) - OH`
`CH_(3) - underset(OH) underset(|)(C) = CH_(2)`

Answer :B
Discussion
19.

C_(3)H_(6)O shows

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CHAIN ISOMERISM
POSITION isomerism
metamerism
functional isomerism

ANSWER :D
Discussion
20.

C_(3)H_(6)O did not give a silver mirror with Tollens' reagent, but gave an oxime with hydroxylamine. It can give positive

Answer»

iodoform test
Fehling's test
Schiff's test
Carbylamine test

Solution :Since `C_(3)H_(6)O` forms an oxime with hydroxylamine, it must be an aldehyde or a KETONE. Since it does not give silver mirror test, it must be a ketone, i.e.,, `CH_(3)COCH_(3)`. Since it is a methyl ketone, THEREFORE, it gives iodoform test.
Discussion
21.

C_(3)H_(8)O underset(K_(2)Cr_(2)O_(7)//H^(+))overset((O))rarr C_(3)H_(6)O overset(I_(2)//NaOH)rarr CHI_(3) In this sequence, the starting compound is

Answer»

1- PROPANOL
Propanal
2- propanol
Ethy1 methy1 ETHER

ANSWER :C
Discussion
22.

C_(3) H_(8)+Br_(2) overset(AlBr_(3)) to A (major product) C_(2)H_(5)ONa+A to B. What is B in above reaction ?

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`CH_(3)CH_(2)CH_(2)OC_(2)H_(5)`
`CH_(3) CH=CH_(2)`
`(CH_(3))_(2)CHOC_(2)H_(5)`
all of the above

Solution :`CH_(3)H_(8)+Br to CH_(3)-CHBr-CH_(3)`
`C_(2)H_(5)Ona+CH_(3)-CHBrCH_(3) to CH_(3)CH=CH_(2)`
Discussion
23.

C_(2)H_(6)(g) + 3.5O_(2)(g) rarr 2CO_(2)(g) + 3H_(2)O(g) DeltaS_("vap") (H_(2)O,l) = "x"_(1)calK^(-1) (boiling point =T_(1)) DeltaH_(f)(H_(2)O,l) = "x"_(2) DeltaH_(f)(CO_(2)) = "x"_(3) DeltaH_(f)(C_(2)H_(6)) = "x"_(4) Hence , DeltaH for the reaction is-

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`2"x"_(3) + 3"x"_(2)-"x"_(4)`
`2"x"_(3) + 3"x"_(2)-"x"_(4) + 3"x"_(1)T_(1)`
`2"x"_(3) + 3"x"_(2)-"x"_(4) - 3"x"_(1)T_(1)`
`"x"_(1)T_(1) + "X"_(2) + "X"_(3) - "x"_(4)`

Solution :`H_(2)O(I)RARR H_(2)O(G) DeltaH_("vap") = DeltaS_("vap") T_(B.P) = "x"_(1)T_(1)`
`DeltaH_(f)(H_(2)O,g) = DeltaH_(f)(H_(2)O,I) + DeltaH_("vap") = "x"_(2) + "x"_(1)"T"_(1)`
`DeltaH_("reaction") = 2DeltaH_(f) (CO_(2),g) + 3DeltaH_(f)(H_(2)O,g) - DeltaH_(f)(C_(2)H_(6),g)`
`""=2"x"_(3) + 3("x"_(2) + "x"_(1)"T"_(1)) - "x"_(4)=2"x"_(3) + 3"x"_(2) + 3"x"_(1)"T"_(1) - "x"_(4).`
Discussion
24.

C_(2)H_(5)OH+SOCl_(2) overset("Pyridine")rarr x + y + z, in the reaction x, y and z respectively are

Answer»

`C_(2)H_(5)Cl_(2), SO_(2), HCL`
`C_(2)H_(5)Cl, SO_(2), HCl`
`C_(2)H_(5)Cl, SOCL, HCl`
`C_(2)H_(4),SO_(2), Cl_(2)`

SOLUTION :
Discussion
25.

In the following reaction, X and Y respectively are C_(2)H_(5)OH overset(KMnO_(1)//II^(+))toX overset(y)underset(H_(2)SO_(1)//Delta)to CH_(3)COOC_(2)H_(5)

Answer»

`CH_(3)OH , C_(2)H_(5)OH`
`CH_(3)CHO , CH_(3)OH`
`CH_(2) = CH_(2) , CH_(3)COOH`
`CH_(3)COOH , C_(2)H_(5)OH`

Answer :D
Discussion
26.

In the following reaction X and Y respectively are C_2 H_5 OH overset(KMnO_4//H^(o+))to X underset(H_2 SO_4)overset(Y)to CH_3 COOC_2 H_5

Answer»

`CH_3OH , C_2H_5OH`
`CH_3CHO , CH_3OH`
`CH_2 = CH_2, CH_3COOH`
`CH_3COOH , C_2H_5OH`

ANSWER :D
Discussion
27.

C_(2)H_(5)OH overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to A overset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))to B A and B in the above reaction are

Answer»

ACETONE and ACETALDEHYDE
acetaldehyde and acetone
ACETIC ACID and acetaldehyde
acetaldehyde and acetic acid

Answer :D
Discussion
28.

C_2H_5 OHunderset(300^@C) overset(Cu)to CH_3 CHO The aboveprocess is

Answer»

REDUCTION
OXIDATION
DEHYDROGENATION
Both 2 and 3

Answer :D
Discussion
29.

C_(2)H_(5)OH+KMnO_(4)rarrHC_(2)H_(3)O_(2)+MnO_(2)+KOH+H_(2)O is the unbalanced equation if 5g of ethanol & excess amount of aqueous KMnO_(4) are reacted and 5.5g of HC_(2)H_(3)O_(2) result. What is the percent yield in the nearest integer? [Given: Atomic mass of H = 1, C = 12, O = 16]

Answer»


Solution :From the PRINCIPAL of atomic conservation on CARBON
`3XX"moles of "C_(2)H_(5)OH=3xx"moles of "HC_(2)H_(3)O_(2)`
`"moles of "HC_(2)H_(3)O_(2)=(5)/(46)"(Theoretical)"`
`"moles of "HC_(2)H_(3)O_(2)" (experimental)"=(5.5)/(60)`
`"% YIELD "=(5.5)/(60xx5)xx46xx100=84%`
Discussion
30.

C_(2)H_(5)OH overset("Conc. "H_(2)SO_(4))underset(413K)rarr A, A will be :

Answer»

`CH_(2)=CH_(2)`
`C_(2)H_(5)OCH_(3)`
`(C_(2)H_(5))_(2)O`
`CH_(3)CH_(2)CH_(2)CH_(3)`.

Answer :C
Discussion
31.

C_(2)H_(5)OH+Na" (Metal)"rarr X, X+C_(2)H_(5)Br overset("Williamson reaction")rarrY. What are X and Y?

Answer»

Solution :`C_(2)H_(5)OH+Na RARR C_(2)H_(5)ON a:C_(2)H_(5)Br overset("Williamson")underset("reaction")rarr C_(2)H_(5)-O-C_(2)H_(5)`
Ethanol on heating with SODIUM gives sodium ethoxide, in which sodium ethoxide is further reacted with BROMO ETHANE to give ethoxy ethane.
Discussion
32.

C_2H_5OH has higher B.P. than, C_2H_5-SH due to

Answer»

association
dissociation
LOW MOLECULAR mass
two lone pair of ELECTRON on oxygen

Answer :A
Discussion
33.

C_(2)H_(5)OH + HONO_(2) to A + H_(2)O. "A" is

Answer»

Ester
Ether
Alcohol
Alkane

Answer :A
Discussion
34.

C_2 H_5 OH +HCI underset( 200^@ C)overset(ZnCl_2) toC_2 H_5 Cl+H_2OIn this reaction, anhydrous ZnCl_2 acts as

Answer»

DEHYDRATING AGENT
dehydrogenating agent
dehalogenating agent
dehydrohalogenating agent

ANSWER :A
Discussion
35.

C_2H_5OH cannot be dried by anhydrous CaCl_2 because :

Answer»

`C_2H_5OH` is SOLUBLE in water
Explosion takes PLACE
`C_2H_5OH` reacts with `CaCl_2`
None

Answer :C
Discussion
36.

C_2H_5OH can be distinguished from CH_3OH:

Answer»

By `HCI`
By `NH_3`
By solubilities
By IODOFORM test

Answer :D
Discussion
37.

C_(2)H_(5)OH can be converted in to C_(2)H_(5)Cl by reacting with

Answer»

`PCI_(3)`
`PCI_(5)`
`SOCl_(2)` + Pyridine
All the above

Answer :D
Discussion
38.

C_(2)H_(5)OH and CH_(3)COOR can be separated from CH_(3)CHO using

Answer»

TOLLEN's reagent
`I_(2)//NaOH`
`NH_(2)NH_(2)`
`NaHSO_(3)`

SOLUTION :`CH_(3)CHO` reacts with `NaHSO_(3)` to form a white addition compound

`C_(2)H_(5)OH` and `RCOOC_(2)H_(5)` do not react with `NaHSO_(3)`.
Discussion
39.

C_2H_5OH+Aoverset(H^+)hArr C_2H_5COOC_2H_5 + C_2H_5COOH The compound 'A' is

Answer»

`C_2H_5COCl`
`(C_2H_5CO)_2O`
`C_2H_5COOH`
`C_2H_5CHO`

ANSWER :B
Discussion
40.

C_(2)H_(5)OH and C_(6)H_(5)OH can be distinguished by

Answer»

`Br_(2) + H_(2)O`
`FeCl_(3)`
`I_(2)+NaOH`
Both (a) and (c)

Solution :`C_(2)H_(5)OH and C_(6)H_(5)OH` can be distinguished by neutral `FeCl_(3)` solution or `I_(2)+NaOH` solution
`C_(2)H_(5)OH` gives iodoform test with `I_(2)+NaOH` solution while phenol does not give YELLOW ppt. of iodoform.
`C_(2)H_(5)OH + 4I_(2)+ 6NaOH overset(Delta)to underset("iodoform")(CHI_(3))+ NCOONa+5NaI + 5H_(2)O`
`C_(6)H_(5)OH + I_(2) + NaOH to ` No REACTION
`C_(6)H_(5)OH` reacts with neutral `FeCl_(3)` solution to give purple colour while `C_(2)H_(5)OH` does not give any colour with neutral `FeCl_(3)` solution.
Discussion
41.

C_(2)H_(5).OC_(2)H_(5)to underset("red color") underset(darr KCNS) underset( darr Fe^(2+)) (A+B) Which is not true for above reactions?

Answer»

`A` & `B` are explosives
If `A` & `B` are present in ether, then PRIOR ot its use `A` & `B` must be removed from ether
`A` & `B` can not be removed by adding conc. `H_(2)SO_(4)`
When `A` & `B` are TREATED with `Fe^(2+)` followed by `KCNS`, no REDOX reaction is invelved.

Solution :`A` & `B` are peroxides & hydroperoxides which oxidizes `Fe^(2+)` to `Fe^(3+)`
Discussion
42.

C_(2)H_(5)O-overset(O)overset(||)C-OC_(2)H_(5)overset(2CH_(2)MgBr)to A Product A formed can

Answer»

GIVE iodoform test
further REACT with `CH_(3)MgBr//H_(3)O` to give t-butyl alcohol
be obtained by the ozonolysis of 2,3-dimethyl-2-butene
All are CORRECT

Answer :D
Discussion
43.

C_(2)H_(5)NH_(2)underset("reagent")overset("Tilden")to(i)overset(NH_(3))to(ii)underset(HCl)overset(NaNO_(2))to(iii). The product (iii) can be

Answer»

Alcohol
ETHER forms an explosive peroxide
Alkyl CHLORIDE
Alkyl nitrite

Solution :`-`Tilden Reagent is `NOCl`
-CONVERSION of (II)`to`(III) in value diazzolization.

`R^(o+)+Cl^(ө)toR-Cl("Alkyl chloride")`
`R^(o+)+HOHtoR-Cl("Alcohol")`
`R^(o+)+ROHtoR-O-R("Ether")`
`R^(o+)+overset(Theta)(N)O_(2)toR-NO_(2)("REACTION")` (where `-R=-C_(2)H_(5)` in above)
Discussion
44.

C_(2)H_(5)NH_(2)underset("reagent")overset("Tilden")rarr(i)overset(NH_(3))rarr(ii)underset(HCl)overset(NaNO_(2))rarr(iii)

Answer»

ALCOHOL
ETHER
ALKYL chloride
alkyl nitrite

Solution :N//A
Discussion
45.

C_(2)H_(5)NH_(2) overset(HNO_(2))(rarr) A overset(PCl_(3))(rarr)B overset(NH_(3))(rarr) C Recognise the compound C from the following

Answer»

Ethylamine
Acetamide
Propanenitrile
Methylamine.

Solution :`C_(2)H_(5)NH_(2) overset(HNO_(2))(RARR) C_(2)H_(5)OH overset(PCl_(3))(rarr) C_(2)H_(5)CL overset(NH_(3))(rarr) C_(2)H_(5)NH_(2)`
Discussion
46.

C_(2)H_(5)NH_(2) and CH_(3)NHC_(2)H_(5) canbe distinguishedby

Answer»

Hoffmann'sreaction
Williamson'sreactions
Wurtz REACTION
CARBYL AMINES

ANSWER :D
Discussion
47.

C_(2)H_(5)Mgl reacts with HCHO to form last product

Answer»

`CH_(3)CHO`
`C_(3)H_(7)OH`
`CH_(3)COCH_(3)`
`CH_(3)COOCH_(3)`

Solution :
Discussion
48.

C_2H_5Ioverset(NaCN)toDoverset(HO^-)underset("partial hydrolysis")toEoverset(Br_2)underset(NaOH)toF. (ii) Write down the structure of ala-gly.

Answer»

SOLUTION :`DimpliesC_2H_5CN" "EimpliesC_2H_5CONH_2" "FimpliesC_2H_5NH_2`
Discussion
49.

C_2H_5Ioverset(NaCN)toDoverset(HO^-)underset("partial hydrolysis")toEoverset(Br_2)underset(NaOH)toF. (i) Why do glucose and fructose give same osazone product?

Answer»

SOLUTION :
Discussion
50.

C_2H_5I underset(Ag_2O)overset("moist")to P underset(110^(@)C)overset(H_2SO_4)toQ underset(140^(@)) overset(C_2H_5OH)toR. Identify R in the reaction.

Answer»

`C_2H_5COOC_2H_5`
`C_2H_5-O-C_2H_5`
`CH_2=CH_2`
`C_2H_5HSO_4`

ANSWER :B
Discussion