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Haloalkanes and Haloarenes · Question 12

NEET (UG) 2022 (Phase 2)MCQMedium📈 Topic in 12% papers+4−1
1

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

Answer

(4) (A) is correct but (R) is not correct

Solution

As per NCERT, chlorine withdraws electrons through inductive effect and releases electrons through resonance.

⇒ Through resonance, electron density increases more at ortho and para positions, so the halogen is ortho, para directing — Assertion (A) is correct.

⇒ Through inductive effect, chlorine destabilises the intermediate carbocation; through resonance, the halogen tends to stabilise the carbocation and this effect is more pronounced at ortho and para positions.

∵ The inductive effect is stronger than the resonance effect and causes net electron withdrawal (deactivation of the ring), the resonance effect is not the more pronounced one.

∴ The statement in Reason (R), that the resonance effect is more pronounced (than the inductive effect), is not correct.

Answer: (4)

NEET (UG) 2022 (Phase 2)

Keep practising — Haloalkanes and Haloarenes

2

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)
3

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
4

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
5

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
6

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
7

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
8

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)
9

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
10

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)
11

Which of the following compounds undergoes nucleophilic substitution reaction most easily?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2011 (Mains)

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