The increasing order of the following compounds towards HCN addition is : (i) (ii) (iii) (iv)

The increasing order of the following compounds towards HCN addition is :

(i)   (ii)  (iii)(iv)   

  1. (i) < (iii) < (iv) < (ii)
  2. (iii) < (iv) < (i) < (ii)
  3. (iii) < (i) < (iv) < (ii)
  4. (iii) < (iv) < (ii) < (i)

Solution

–I, – M effect of NO2 increase reactivity towards nucleophilic addition reaction with HCN.

Nucleophile attacks on carbon atom of carbonyl group which will be more reactive if any wlectron withdrawing group is attached in ring.

Asked in: JEE Main 2020 (02 Sep Shift 1)

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