The increasing order of the reactivity of the following with L i A l H 4 is: ( A ) ( B ) ( C ) ( D )

The increasing order of the reactivity of the following with LiAlH4 is:

(A)

(B)

(C)

(D)

  1. B<A<D<C
  2. A<B<C<D
  3. A<B<D<C
  4. B<A<C<D

Solution

In the mentioned structures H- will get added to the carbon having slight positive charge.

Presence of Cl increases the positive charge whereas an electron donating group like NH2 decreases the tendency.

Rate of reaction ∝ -M or -I group

Rate of reaction ∝ 1+M and 1+I

Hence, the correct order will be:

Asked in: JEE Main 2019 (12 Jan Shift 2)

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