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.

Benzenediazonium chloride on reaction with phenol in weakly basic medium gives

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Diphenyl ether
p- hydroxyazobenzene
Chlorobenzene
Benzene

Solution :`C_(6)H_(5)N_(2)Cl+C_(6)H_(5)OH`
2.

How does benzene diazonium chloride react with : Cu_2Cl_2//HCl

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ANSWER :F
3.

How does benzenediazonium chloride react with : HNO_2

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ANSWER :F
4.

Benzenediazonium chloride is formed when ........ is treated with .......... and hydrochloric acid at 0-5^@ C.

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SOLUTION : ANILINE, SODIUM NITRITE.
5.

Benzene vapour mixed with air when passed over V_2O_5 catalyst at 775K gives

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Glyoxal
Oxalic acid
Maleic ANHYDRIDE
Fumaric acid

Solution :
6.

Benzene undergoes subsitution reaction more easily than addition because :

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It has cyclic
It has three double bonds
It has SIX HYDROGEN ATOMS
Of resonance

SOLUTION :If there were no resonance in benzene, `pi` electons WOULD have not been delocallsed and hence easily availble to undergo addition reactions as in ethylene. Further the subtituted benzene is stable due to resonance.
7.

Benzene undergoes nitration reaction to form nitrobenzene in this reaction takes place due to the formation of …………….. .

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HYDRONIUM ION
Hydride ion
NITRONIUM ion
Nitrasonium ion

Solution :Nitronium ion
8.

Benzene, touene, xylene (o,m,p) and mesitylene dissolve in HBF_(4) to fromsalts. Expalin the order of basicity: Mesitylene gt m- "Xylene" gt o- and p- Xylenen gt Toulene gt Benzene

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Solution :
The reaction is reversible, the more stable the `sigam-` complex is, the more will be the equilibriumon the right , i.e., the more basicis the ARENE. More the number of `EDGH` [(Me)` group], more is the stability of the complex, and more basic is the compound.

Because of `+I` effect of `(Me)` the positive charge is partically neutralised and `(Me)` group acquires `+dela` charge. i.e., there is chargespreading whichincreases the stabilityof the `sigma-` complex and thus increases the basic CHARACTEROF toluene w.r.t benzene.
Mesitylene thas three `(Me)` groups so it must be thestrongest BASE accordingly. Resonating structures of `m-o-` an d`p-` XYLENES are:


In `o-` p-` xylenes the resonace-contributing stuctes (VII) and (X) are slightly less stable than other resonaitngsturctures. So one can conclue that resonatingstructers of `m-` xylene are more stable than `o-` and `p-` xylenes which increases the basic character of `m-` xylene than `sigma-` and `p-` xylenes.
SO the order of basic character is:
9.

How will you prepare the following compounds from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom {:("(i) Methyl benzoate"," (ii) m-Nitrobenzoic acid"),("(iii) p-Nitrobenzoic acid"," (iv) Phenylacetic acid"),("(v) p-Nitrobenzaldehyde.",):}

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SOLUTION :
10.

Benzene to phenylacetic acid .

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SOLUTION :
11.

Benzene to p-nitrobenzoic acid

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SOLUTION :
12.

Benzene to p-nitrobenzaldehyde

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SOLUTION :
13.

How will you convert benzene into N, N-dimethlaniline ?

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SOLUTION :
14.

Benzene to methylbenzoate

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SOLUTION :
15.

The correct set of reagents (X, Y, Z) required to convert benzene to m-nitrobenzoic acid are

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SOLUTION :
16.

Benzene to m-nitrobenzoic acid .

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SOLUTION :
17.

Benzene to m-nitroacetophenone .

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SOLUTION :
18.

Write the relavant chemical equations : Benzene to 4-bromonitrobenzene

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SOLUTION :
19.

Write the relavant chemical equations : Benzene to biphenyl

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SOLUTION : (This is FITTING REACTION)
20.

Benzene sulphonyl chloride (C_(6)H_(5)SO_(2)Cl) is called Hinsberg's reagent. It is used for the distinction between primary, secondary and teriary amines. It is also used for separation of primary, secondary and teritiary amines from their mixture. (1^(@), 2^(@), 3^(@) amines in mixture) Which of the following amines represent C?

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`C_(2)H_(5)-NH_(2)`


ANSWER :B
21.

Benzene sulphonyl chloride (C_(6)H_(5)SO_(2)Cl) is called Hinsberg's reagent. It is used for the distinction between primary, secondary and teriary amines. It is also used for separation of primary, secondary and teritiary amines from their mixture. (1^(@), 2^(@), 3^(@) amines in mixture) Which of the folloiwng is primary amine R-NH_(2)?

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A
B
C
Cannot be predicted

Answer :B
22.

Benzene sulphonyl chloride (C_(6)H_(5)SO_(2)Cl) is called Hinsberg's reagent. It is used for the distinction between primary, secondary and teriary amines. It is also used for separation of primary, secondary and teritiary amines from their mixture. (1^(@), 2^(@), 3^(@) amines in mixture) Which of the following amines does not react with benzene sulphonyl chloride?

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Both a and b

Answer :C
23.

Benzene sulphonyl chloride (C_(6)H_(5)SO_(2)Cl) is called Hinsberg's reagent. It is used for the distinction between primary, secondary and teriary amines. It is also used for separation of primary, secondary and teritiary amines from their mixture. (1^(@), 2^(@), 3^(@) amines in mixture) Which of the following is correctly matchd?

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ANSWER :A
24.

Benzene sulphonyl chloride and aqueous NaOH can be used to distinguish three classes of amines such as primary, secondary and teritary Name the above test

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SOLUTION :Hinsberg TEST
25.

Benzene on heating with fuming H_(2) SO_(4) to 200^(@) C gives :

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BENZENE
TOLUENE
m-benzene disulphonic ACID
p-benzene disulphonic acid

ANSWER :C
26.

Benzene sulphonic acid is reacted with NaOH gives

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sodmm phenoxide
cumene
cumene hydroperoxide
sodium BENZENE sulphonate

Answer :D
27.

Benzeneshows

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Substitution
Addition
Oxidation
All of these

ANSWER :D
28.

Benzene reacts with sulphuric acid to gives, …………………… .

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SULPHATE
sulphide
sulphonic ACID
sulphite

Solution :sulphonic acid
29.

Benzene reacts with n-propyl chloride in the presence of anhydrous AICI_(3)to give(c) No reaction (d) Isopropylbenzene

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3 -PROPYL- 1 -CHLOROBENZENE
n-Propylbenzene
No REACTION
Isopropylbenzene

Solution :
30.

Benzene reacts with I_2 in presence of which of the following to give iodobenzene

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`HNO_3`
HI
`SO_2`
`H_2O`

ANSWER :A
31.

Benzene reacts with n-propyl bromide in presence of anhydrous AlCl_(3) to predominantly yield

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n-propylbenzene
ethylbenzene
isopropylbenzene
methylbenzene.

Solution :The initially formed less stable n - PROPYL carbocation `(1^(@))` REARRANGES to the more stable isopropyl carbocation `(2^(@))` before attacking the BENZENE ring to form isopropylbenzene, i.e.,
`CH_(3)CH_(2)CH-Broverset("Anhyd.")underset(AlCl_(3))rarr CH_(3)CH_(2)overset(+)CH_(2) overset("1,2-hydride")underset("shift")rarr CH_(3)-overset(+)CH-CH_(3)overset(C_(6)H_(6))underset(-H^(+))rarr underset("isopropyl benzene")(C_(6)H_(5)-CH(CH_(3))_(2))`
32.

Benzene reacts with Cl_(2) in sunlight to give a final product

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`C_(6)Cl_(6)`
`C_(6)H_(6)Cl_(6)`
`C_(6)H_(5)CL`
`C Cl_(4)`

ANSWER :B
33.

Benzene reacts with chlorine to form chlorobenzene in presence of K_2Cr_2O_7.

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SOLUTION :In PRESENCE of LEWIS ACID LIKE `Fecl_3`
34.

Benzene reacts with Cl_(2) in presence of a halogen carrier to produce

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BENZYL chloride
benzal chloride
chlorobenzene
benzene hexachloride

Answer :C
35.

Benzene reacts with chlorine in sunlight to give a final product

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`C CI_(4)`
`C_(6)H_(6)CI_(6)`
`C_(6)CI_(6)`
`C_(6)H_(5)CI`

Solution :Benzene REACTS with CHLORINE in SUNLIGHT to give a final product.
36.

Benzene reacts with chlorine to form chlorobenzene in presence of K_2Cr_2O_7. Is it true or false?

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SOLUTION :In PRESENCE of LEWIS ACID LIKE `Fecl_3`
37.

Benzene reacts with CI_2 in presence of direct sunlight to give ________

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666
BHC
Gammexane
All

Answer :B
38.

Benzene reacts with CH_3COCl in the presence of AlCl_3 to give

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`C_6H_5Cl`
`C_6H_5COCl`
`C_6H_5CH_3`
`C_6H_5COCH_3`

SOLUTION :
39.

Benzene reacts with CH_3 COCl in the presence of AICI_3 to give

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`C_6 H_5 COCH_3`
`C_6 H_6 COCL`
`C_6 H_5 CH_3`
`C_6 H_5 CL`

ANSWER :A
40.

Benzene reacts with a mixture of conc. H_(2)SO_(4) and HNO_(3) to give :

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PHENOL
BENZENE DIAZONIUM chloride
benzene sulphonic ACID
NITROBENZENE

Answer :D
41.

Benzene on treatment with a mixture of conc.HNO_3 and conc. H_2SO_4 at 100^@C gives

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Nitrobenzene
m-dinitrobenzene
p-dinitrobenzene
o-dinitrobenzene

Solution :
42.

Benzene overset( "oleum") to A overset( NaoH) to B underset( -NaCl)overset( HCl) to CIncorrect statement among the following is

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Aqueous solution of B is ACIDIC
A' is Benzene sulphonic ACID
`0.2 % `of 'C' can be used as antispectic
C' is more acidic than WATER

Answer :A
43.

Benzene on reaction with NOCl in presenceof acid producesan organic compound (A).(A) on treatment with NaNH_2//liq.NH_3 furnishes another organic compound (B) .(B) on treactment with NaNO_2//HBF_4 affords an organic compound ( C) which on heating gives an organic compound (D). Identify (A),(B) ,(C) and (D) .

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SOLUTION :
44.

Benzene on reaction with HOCl in presence of an acid produces organic compound (A). (A) on treatment with NaNH_(2)//liq." "NH_(3) furnishes another organic compound (B). (B) on treatment with HBF_(4) affords an organic compound (C) which on heating with NaNO_(2) gives organic compound (D). Identify (A), (B), (C) and (D).

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Solution :(i) `HOCl` in presence of an acid generates the reactive electrophile, chloronium ION `(Cl^(+))` which attacks benzene to give chlorobenzene (A).

(ii) Chlorobenzene (A) on treatment with `NaNH_(2)//liq." "NH_(3)` undergoes dehydrohalogenation via benzyne to afford aniline (B).

(iii) Aniline (B) on treatment with `HBF_(4)` forms the CORRESPONDING salt anilinium tetrafluoroborate (C) which on HEATING with `NaNO_(2)` undergoes Balz-Schiemann reaction through the intermedium formation of benzenediazonium tetrafluoroborate to affford FLUOROBENZENE (D).
.
45.

Benzene + O_(3) rarr Y. In this reaction Y is :

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BENZENE monoozonide
Benzene diozonide
Benzene triozonide
Succinic ACID

ANSWER :C
46.

Benzene molecule contains following hybrid orbitals:

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6 `sp^2`
3 `sp^2`
6 `sp^3`
3 `sp^3`

ANSWER :A
47.

Benzene on heating strongly in the presence of V_(2)O_(5) gives :

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maleic acid
BENZALDEHYDE
BENZOIC acid
`CO_(2) and H_(2)O`

Solution :
48.

Benzene is reacted with carbon monoxide in HCl in the presence of catalyst, cupric chloride gives

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ANSWER :C
49.

Benzene is reacted with chlorine in the presence of FeCl_(3) gives A, which is reacted with sodium in ether gives

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BENZOIC ACID
benzaldehyde
diphenyl
toulene

Answer :C
50.

Benzene is prepared in laboratory from which one of the following compounds

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`C_6N_5N_2Cl`
`C_6H_5OH`
`C_6H_5COONa`
`C_6H_5SO_3H`

Solution :`UNDERSET"SODIUM benzoate"(C_6H_5COONa)+NAOH overset"CAO"to underset"BENZENE"(C_6H_6)+Na_2CO_3`