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.

Beryl is:

Answer»

`BaSO_4`
`BaCl_2.2H_2O`
BEO
`BaCO_3`

ANSWER :C
Discussion
2.

Beri-Beri is caused due to deficiency of ………………….

Answer»

VITAMIN `B_(1)`
Vitamin B
Vitamin C
Vitamin D

SOLUTION :Vitamin `B_(1)`
Discussion
3.

Berilium and Al are placed in different periods and groups but they show the similar properties.

Answer»

Solution :On moving ACROSS a period the CHARGE on the ions increases and the size decreases, CAUSING the POLARIZING power to increase. On moving down a group the size increases and polarizing power decreases. On moving diagonally l.e., from Be to Al these two effects partly cancel each other and so there is no marked CHANGE in properties.
Discussion
4.

Berthelot's salt is:

Answer»

`KClO_3`
`KIO_3`
`KBrO_3`
None

Answer :A
Discussion
5.

Beri-beri is caused due to

Answer»

vit-A
vit-C
vit-B
vit-D

Answer :C
Discussion
6.

Beri-Beri disease is caused by deficiency of which vitamin ?

Answer»

SOLUTION :VITAMIN `B_1`
Discussion
7.

Beri-Beri is caused due to :

Answer»

VITAMIN A
Vitamin `B_1`
Vitamin C
Vitamin D

Answer :B
Discussion
8.

Be(OH)_(2) in alkali solutions forms :

Answer»

`Be^(2+)andH_(2)O`
`[Be(OH)_(4)]^(2-)`
BeO
`[Be(OH)_(6)]^(4-)`

Answer :B
Discussion
9.

Benzylidene chloride (C_6H_5Cl) can be prapared from toluene by chlorination with

Answer»

`PCl_5`
`SOCl_2`
`Cl_2//hv`
NaOCl

Solution :Both `SO_2Cl_2 " and " Cl_2//hv` are the SOURCES of free radicals so chlorination TAKES place at - `CH_3` GROUPS .
Discussion
10.

Benzylhydrol is ________

Answer»

phenaceyl BROMIDE
METHYL carbinol
diphenyl carbinol
phenyl carbinol

Answer :C
Discussion
11.

Benzylamine reacts with nitrous acid to form :

Answer»

AZOBENZENE
Benzene
Benzylalcohol
Phenol

Answer :C
Discussion
12.

Benzylchloride to 2-phenulethanamine

Answer»

SOLUTION :
Discussion
13.

Benzylamine may be alkylated as shown in the following equation : ""C_(6)H_(5)CH_(2)NH_(2)+R-X rarr C_(6)H_(5)CH_(2)NHR Which of the following alkylhalides is best suited for this reaction through S_(N)1 mechanism ?

Answer»

`CH_(3)BR`
`C_(6)H_(5)Br`
`C_(6)H_(5)Br`
`C_(6)H_(5)CH_(2)Br`

Answer :C
Discussion
14.

Benzylamine maybe alkylated as shown in the following equation: C_(6)H_(5)CH_(2)NH_(2)+R-XtoC_(6)H_(5)CH_(2)NHR Which of the following alkyl halides is best suited for this reaction through S_(N)1 mechanism?

Answer»

`CH_(3)BR`
`C_(6)H_(5)Br`
`C_(6)H_(5)CH_(2)Br`
`C_(2)H_(5)Br`

Solution :Since `C_(6)H_(5)CH_(2)Br` on ionization GIVES a RESONANCE stabilizd bynzyl carboncation `(C_(6)H_(5)CH_(2)^(+))`, therefore, `C_(6)H_(5)CH_(2)Br` is best sutied for `S_(N)1` reaction.
Discussion
15.

Benzyl amine may be alkylated as shown in the following equation : C_6H_5 CH_2NH_2 + R - X to C_6H_5CH_2NHR Which of the following alkyl halides is best suited for this reaction through S_(N^1) mechanism ?

Answer»

`CH_3 BR`
`C_6 B_5 Br`
`C_6 H_5 CH_2 Br`
`C_2 H_5 Br`

Solution :`C_6 H_5 CH_2Br` is best suited for `S_(N^1)` REACTION because upon IONIZATION its gives the resonance STABILIZED benzyl carbocation
` (C_6 H_5 CH_(2)^(+))`
Discussion
16.

Benzylamine may be alkylated as shown in the following equation : C_(6)H_(5)CH_(2)NH_(2)+R-X rarr C_(6)H_(5)CH_(2)NHR Which of the following alkyl halides is best suited for this reaction through SN​ 1 mechanism?

Answer»

`CH_(3)Br`
`C_(6)H_(5)Br`
`C_(6)H_(5)CH_(2)Br`
`C_(2)H_(5)Br`

Solution :`C_(6)H_(5)CH_(2)Br` on ionization gives benzyl carbocation. `C_(6)H_(5)CH_(2)^(+)` which is resonance stabilized.
Therefore, `C_(6)H_(5)CH_(2)Br` is best suited for `S_(N)1` REACTION.
Discussion
17.

Benzylamine is more hasic than

Answer»

Aniline
Ammonia
p-nitroaniline
Sodium hydroxide

Solution :ALIPHATIC AMINES are more BASIC than AROMATIC
Discussion
18.

Benzylamine is a stronger base than aniline because :

Answer»

The lone pair of electrons on the NITROGEN
atom in BENZYLAMINE is delocalised
The lone pair of electrons on the nitrogen atoms in ANILINE is delocalised.
The lone pair of electrons on the nitrogen atom in aniline is not involved in resonance.

Answer :B
Discussion
19.

Benzylamine may be alkylated as shown in the following equation:C_6 H_5 CH_2 NH_2 +R -X to C_6 H_5CH_2 NHR Which of the following alkylhalides is best suited for this reaction through S_(N^1) mechanism?

Answer»

`CH_3 Br`
`C_6 B_5 Br`
`C_6 H_5 CH_2 Br`
`C_2 H_5 Br`

Solution :`C_6 H_5 CH_2Br` is best SUITED for `S_(N^1)` reaction because upon ionization its gives the RESONANCE stabilized BENZYL carbocation
` (C_6 H_5 CH_(2)^(+))`
Discussion
20.

Benzylamine can be obtained from benzonitrile by

Answer»

hydrolysis
reduction
oxidation
reaction with ammonia.

Answer :B
Discussion
21.

Benzyl halideon ammonolysisproduces

Answer»




SOLUTION :
Discussion
22.

Benzylamine and aniline can be distinguish by

Answer»

`HNO_(2)` ACID
`CHCl_(3)//KOH`
`Br_(2)` water
Schiff's reagent

Answer :3
Discussion
23.

Benzyl phenyl ether reacts with hydrogen bromide to give

Answer»

BENZYL BROMIDE and phenol
benzyl ALCOHOL and bromobenzene
benzyl bromide and bromobenzene
benzyl alcohol andphenol

Answer :A::B::D
Discussion
24.

Benzyl chloride undergoes nucleophilic substitution much more easily than chlorobenzene. Explain.

Answer»

Solution :Benzyl chloride undergoes NUCLEOPHILIC substitution readily VIA resonance stabilised benzyl carbocation

On the otherhand `C-Cl` bond in benzene has PARTIAL double bond character due to resonance and hence is DIFFICULT to cleave. Hence, benzyl chloride undergoes nucleophilic substitution much more easily than chlorobenzene
Discussion
25.

Benzyl chloride reacts with chlorobenzene in the presence of dry ether to give :

Answer»

Dibenzyl
Methylbenzyl CHLORIDE
Diphenylmethane
o-Phenyltoluene

Solution :
Discussion
26.

How will you convert (i) Ethyl magnesium chloride to propan-1-ol ? (ii) Benzyl chloride to benzyl alcohol ?

Answer»

SOLUTION :BENZYL CHLORIDE to benzyl ALCOHOL :
Discussion
27.

Benzyl chloride is prepared from toluene by chlorination with

Answer»

`Cl_(2)//FeCl_(3)`
`Cl_(2)//U.V. "light"`
`SOCl_(2)`
`HCOL`

ANSWER :B
Discussion
28.

Benzyl chloride on oxidation with copper nitrate gives :

Answer»

BENZYL ALCOHOL
BENZOIC acid
Benzyl acetate
Benzaldehyde

SOLUTION :
Discussion
29.

Benzyl chloride is more reactive than chlorobenzene towards nucleophilic substitution. Explain.

Answer»

Solution :In the molecules of BENZYL chloride, the electron pairs on the chlorine atom are not in a position to conjugate with the `PI`-electrons of the RING.

Whereas electron pairs on the chlorine atom are in CONJUGATION with the `pi`-electrons of the ring in the molecules of chlorobenzene. Consequently, the C-Cl bond in chlorobenzene acquires some double bond character, which is not present in benzyl chloride. As a result, the REACTIVITY of benzyl chloride is more than the chlorobenzene.
Discussion
30.

Benzyl chloride (C_6H_5CH_2Cl) can be prepared from toluene by chlorination with

Answer»

`SO_2Cl_2`
`SOCl_2`
`Cl_2`
NaOHCl

Solution :
Discussion
31.

Benzyl chloride is an aryl hlide

Answer»
Discussion
32.

Benzyl chloride (C_(6)H_(5)CH_(2)Cl) can be prepared from toluene by chlorination with:

Answer»

`SO_(2)Cl_(2)`
`SOCl_(2)`
`Cl_(2)`
`NaOCl`

SOLUTION :both `SOCl_(2)` and `Cl_(2)` can be used for the chlorination of BENZYL chloride.
Discussion
33.

Benzyl chloride and o-chlorotoluene are isomers.

Answer»
Discussion
34.

Benzyl alcohol with concentrated H_(2)SO_(4) gives resinous material which gas high boiling point. Explain.

Answer»

Solution :
Since this resinous MATERIAL has large molecular MASS and STRONG COVALENT bonding, it has high BOILING point.
Discussion
35.

Write chemical reactions to affect the following transformations : Benzyl alcohol to phenylethanoic acid

Answer»

Solution :`C_(6) H_(5) CH_(2) OH overset(Br_(2))(to) C_(6) H_(5) CH_(2) Br overset(KCN)(to) C_(6) H_(5) CH_(2) CN overset(H_(3) O^(+)) (to) C_(6) H_(5) CH_(2) COOH`
Discussion
36.

Benzyl alcohol to benzoic acid

Answer»

SOLUTION :
Discussion
37.

Benzyl alcohol on treatment with PCl_(5) gives :

Answer»

BENZENE
BENZYL chloride
Toluene
Phenol

Answer :B
Discussion
38.

Write the relavant chemical equations : Benzyl alcohol to 2-phenylethanoic acid

Answer»

SOLUTION :
Discussion
39.

Name the reagents used in the following reactions : (i) Benzyl alcohol to benzoic acid. (ii) Dehydration of propan -2-ol to propen. (iii) Butan-2-one to buttan-2-ol.

Answer»

SOLUTION :BENZYL ALCOHOL to BENZOIC ACID :
Discussion
40.

Benzyl alcohol and phenol cann be distinguished by using____reagent.

Answer»

SOLUTION :NEUTRAL `FeCl_(3)`
Discussion
41.

Benzyl alcohol and sodium benzoate is obtained by the action of sodium hydroxide on benzaldehyde. This reaction is known as

Answer»

A) Perkin's reaction
B) CANNIZZARO's reaction
C) Sandmeyer's reaction
D) Claisen condensatio

Solution :Benzaldehyde on treatment with 50% aqueous or ethanolic alkali solution UNDERGOES Cannizzaro.s reaction like HCHO (no Ol-hydrogen atom) i.e. one molecule is oxidised and one is reduced with the formation of benzoic acid and benzyl alcohol respectively
`2C_(6)H_(5)CHOoverset(NaOH)toC_(6)H_(5)CH_(2)OH + C_(6)H_(5)COONA`
Discussion
42.

Benzyl alcohol is obtained by reduction of

Answer»

BENZOIC ACID
acetophenone
benzonitrile
BENZAMIDE

ANSWER :A
Discussion
43.

Benzyl alcohol and phenol can be distinguished by the use of :

Answer»

`FeCl_(3)`
Na
LUCAS REAGENT
None of these

Solution :PHENOL reacts with `Fecl_(3)` WHEREAS Benzyl alcohol does not.
Phenol does.t with lucas reagent whereas benzyl alcohol does.
Discussion
44.

Benzoyl peroxide acts as an initiator for:

Answer»

CATIONIC POLYMERIZATION
ANIONIC polymerization
free RADICAL polymerization
condensation polymerization

Answer :C
Discussion
45.

Benzoylation of aniline gives benzanilide product. Which name is associated with the following reaction?

Answer»

KAKULE
SCHOTTEN Bauman
GATTERMANN
Hinsberg

ANSWER :B
Discussion
46.

Benzoylation of phenol in alkaline medium is known as

Answer»

Friedel Craft REACTION
Wurtz-Fittig reaction
Schotten-Baumann reaction
Sabatier-Senderen reaction

Solution :Alcohols , primary and secondary amines containing ACTIVE HYDROGEN can be benzoylated or acetylated in presence of aqueous sodium hydroxide as ACID scavengers in a reaction known as Schotten Baumann reaction. The PURPOSE of acid scavenger is to remove the acid formed as by product in this reaction.
Discussion
47.

Benzoylation reaction of-NH_(2) group is known as :

Answer»

Balz - Schimann's REACTION
Schotten-Baumann's reaction
GABRIEL phthalimide reaction
Friedal CRAFT reaction

ANSWER :B
Discussion
48.

Benzoyl chloride on reduction with H_(2) in the presence of Pd-BaSO_(4) gives benzaldehyde. What is this reaction known as ?

Answer»

SOLUTION :Rosenmund.s REDUCTION
Discussion
49.

How will you convert benzoyl chloride into benzaldehyde?

Answer»

SOLUTION :Benzoyl chloride into BENZALDEHYDE :

This reaction is CALLED ROSENMUND reduction.
Discussion
50.

Benzophenone is prepared by the dry distillation of

Answer»

CALCIUM BENZOATE and calcium acetate
calcium benzoate and calcium formate
calcium benzoate
calcium acetate.

Answer :C
Discussion