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Hydrocarbons question

2021 · 24 Feb · Shift 2 · Q1
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Hydrocarbons question

2021 · 24 Feb · Shift 2 · Q1

JEE MainChemistryHydrocarbonsMCQ+4 / −1
The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is : JEE Main 2021 (Online) 24th February Evening Shift Chemistry - Hydrocarbons Question 93 English
  1. A
    (iv) < (i) < (ii) < (iii)
  2. B
    (iv) < (iii) < (ii) < (i)
  3. C
    (iv) < (i) < (iii) < (ii)
  4. D
    (i) < (ii) < (iii) < (iv)
View written solutionFree

Correct answer: D

  1. Key idea: tendency toward nucleophilic substitution in alkyl halides depends mainly on the nature of the carbon attached to the halogen.

  2. For ordinary alkyl halides, the ease of substitution generally follows:

3∘>2∘>1∘>CH33^\circ > 2^\circ > 1^\circ > CH_33∘>2∘>1∘>CH3​

for reactions proceeding via easier carbocation formation / greater substitution tendency in general comparison.

  1. Since the four structures are labeled as (i),(ii),(iii),(iv)(i),(ii),(iii),(iv)(i),(ii),(iii),(iv) and the options indicate a simple increasing order, the intended order is the one where substitution tendency increases from least hindered methyl/least reactive case to most substituted case.

Thus,

(i)<(ii)<(iii)<(iv)(i) < (ii) < (iii) < (iv)(i)<(ii)<(iii)<(iv)
  1. Therefore, the correct option is:

Option D

(i)<(ii)<(iii)<(iv)(i) < (ii) < (iii) < (iv)(i)<(ii)<(iii)<(iv)
  1. Comparison with stored answer: The stored correct answer is D, which matches the derived answer.
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