Question

The false statements among the following are 

1. a primary carbocation is less stable than a tertiary carbocation 

2. secondary propyl carbocation is more stable than allyl carbocation

3. a tertiary free radical is more stable than a primary free radical

4. isopropyl carbanion is more stable than ethyl carbanion

(a) 1 and 2

(b) 2 and 3

(c) 1 and 4

(d) 2 and 4

Answer 1

Correct option is (d) 2 and 4

(i) Allyl carbocation is more stable than the secondary carbocation due to resonance.

(ii) Among carbanions, primary carbonions are more stable than the secondary carbanions.