Q7 · CSIR NET Chemistry, December 2017
Paper: CSIR NET December 2017 · Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: Carbocation Stability · Marks: 2 · Difficulty: Hard
The correct order of stability of the following carbocations is 
(A) (B) (C)
(A) (B) (C)(a)A $>$ C $>$ B
(b)B $>$ C $>$ A
(c)C $>$ A $>$ B
(d)C $>$ B $>$ A
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
C (MeO–C⁺Me₂) is an oxocarbenium ion, stabilised by O lone-pair donation, and is the most stable. B is a tertiary allylic cation. A is a tertiary cation weakened by the β-OMe (–I). C > B > A (d).
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