STANDARDChemistry-Organic Chemistry
STANDARD Chemistry Carbanions MCQ Question
Type: MCQ-conceptual-Medium
The order of decreasing stability of the following carbanions is (i) (CH₃)₃C⁻ (ii) (CH₃)₂CH⁻ (iii) CH₃CH₂⁻ (iv) C₆H₅CH₂⁻
A
(i) > (ii) > (iii) > (iv)
B
(iv) > (iii) > (ii) > (i)
C
(iv) > (i) > (ii) > (iii)
D
(iii) > (ii) > (i) > (iv)
Correct Answer
Option B
Detailed Explanation
Stability of carbanions decreases with increase in +I effect. +I effect is maximum in (CH₃)₃C⁻, followed by (CH₃)₂CH⁻ and CH₃CH₂⁻. In C₆H₅CH₂⁻, resonance effect increases the stability. Hence, the order of stability is (iv) > (iii) > (ii) > (i).
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