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Haloalkanes and Haloarenes · Question 11

NEET (UG) 2022MCQEasy📈 Topic in 25% papers+4−1
1

Which of the following sequence of reactions is suitable to synthesize chlorobenzene?

  1. Benzene, Cl2, anhydrous FeCl3
  2. Phenol, NaNO2, HCl, CuCl
  3. [figure] , HCl
  4. [figure] , HCl, Heating

Answer

(1) Benzene, Cl2, anhydrous FeCl3

Solution

(1) As per NCERT, aryl chlorides are prepared by electrophilic substitution of arenes with chlorine in the presence of a Lewis acid:

C6H6 + Cl2 anhyd. FeCl3 C6H5Cl + HCl ⇒ suitable.

(2) Phenol has no -NH2 group, so NaNO2/HCl cannot form a diazonium salt; the C-OH bond of phenol is not replaced by Cl either.

(3) Benzene does not react with HCl.

(4) Aniline with HCl only forms the salt anilinium chloride, C6H5NH3+Cl- (chlorobenzene needs diazotisation and then CuCl/HCl, Sandmeyer reaction).

Answer: (1)

NEET (UG) 2022

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2

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

  1. (A) is not correct but (R) is correct
  2. Both (A) and (R) are correct and (R) is the correct explanation of (A)
  3. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  4. (A) is correct but (R) is not correct
NEET (UG) 2022 (Phase 2)
3

Predict the order of reactivity of the following four isomers towards SN2 reaction. (I) CH3CH2CH2CH2Cl (II) CH3CH2CH(Cl)CH3 (III) (CH3)2CHCH2Cl (IV) (CH3)3CCl

  1. (IV) > (II) > (III) > (I)
  2. (IV) > (III) > (II) > (I)
  3. (I) > (II) > (III) > (IV)
  4. (I) > (III) > (II) > (IV)
NEET (UG) 2022 (Phase 2)
4

The major product formed in dehydrohalogenation reaction of 2-bromopentane is pent-2-ene. This product formation is based on?

  1. Hückel's Rule
  2. Saytzeff's Rule
  3. Hund's Rule
  4. Hofmann Rule
NEET (UG) 2021
5

The correct sequence of bond enthalpy of 'C-X' bond is :

  1. CH3-Cl > CH3-F > CH3-Br > CH3-I
  2. CH3-F < CH3-Cl < CH3-Br < CH3-I
  3. CH3-F > CH3-Cl > CH3-Br > CH3-I
  4. CH3-F < CH3-Cl > CH3-Br > CH3-I
NEET (UG) 2021
6

Elimination reaction of 2-Bromopentane to form pent-2-ene is :

  1. A, C and D only
  2. B, C and D only
  3. A, B and D only
  4. A, B and C only
NEET (UG) 2020
7

The compound C7H8 undergoes the following reactions : C7H8 3Cl2/ A Br2/Fe B Zn/HCl C The product 'C' is

  1. m-bromotoluene
  2. o-bromotoluene
  3. 3-bromo-2,4,6-trichlorotoluene
  4. p-bromotoluene
NEET 2018
8

Identify A and predict the type of reaction. [figure]

  1. [figure] and elimination addition reaction
  2. [figure] and cine substitution reaction
  3. [figure] and cine substitution
  4. [figure] and substitution reaction
NEET 2017
9

Consider the reaction, CH3CH2CH2Br + NaCN CH3CH2CH2CN + NaBr The reaction will be the fastest in

  1. ethanol
  2. methanol
  3. N,N-dimethylformamide (DMF)
  4. water
NEET 2016 (Phase 2)
10

Which of the following reaction(s) can be used for the preparation of alkyl halides? (I) CH3CH2OH + HCl Anh. ZnCl2 (II) CH3CH2OH + HCl Anh. ZnCl2 (III) (CH3)3COH + HCl Anh. ZnCl2 (IV) (CH3)2CHOH + HCl Anh. ZnCl2

  1. (I) and (II) only
  2. (IV) only
  3. (III) and (IV) only
  4. (I), (III) and (IV) only
AIPMT 2015
11

In the replacement reaction [figure] The reaction will be most favourable if M happens to be

  1. Na
  2. K
  3. Rb
  4. Li
AIPMT 2012 (Mains)

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