Decreasing order of hydride affinity for carbocations:
General Organic Chemistry (GOC) · Class 11 · JEE Main Previous Year Question
Decreasing order of hydride affinity for carbocations:
- a
(A) > (C) > (B) > (D)
- b✓
(C) > (A) > (B) > (D)
- c
(C) > (A) > (D) > (B)
- d
(A) > (C) > (D) > (B)
(C) > (A) > (B) > (D)
Hydride Affinity and Carbocation Stability Hydride affinity is the tendency of a carbocation to accept a hydride ion. It is inversely proportional to the stability of the carbocation. The more stable the carbocation, the lower its affinity for hydride.
- (D): Tricyclopropylmethyl cation (Exceptionally stable due to Bent orbital overlap). Lowest hydride affinity.
- (B): Triphenylmethyl cation (Stable due to resonance with three rings).
- (A): Allylic + tertiary stabilized cation.
- (C): tert-butyl cation (Least stable among the four).
Step 2: Order of Affinity Affinity order: (C) > (A) > (B) > (D).
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