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Question

The order of decreasing stability of the carbanions is:
1) (CH3)3C−
2) (CH3)2CH−

3) CH3CH2−

4) C6H5CH2−

A
1>2>3>4
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B
4>3>2>1
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C
4>1>2>3
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D
1>2>4>3
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Solution

The correct option is C 4>3>2>1
More the +I effect, lesser is the stability of carbanions. So, stability of carbanion order is: 10>20>30. Benzyl carbanion is most stable because of resonance stablisation.

Stability order is: 4>3>2>1

C6H5CH2 >CH3CH2>(CH3)2CH>(CH3)3C

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