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Question
Which of the following carbanions is the most stable?
Which of the following carbanions is the most stable?
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Solution
The correct option is D
The stability of carbanion depends upon the nature of group at the para position. An electron-withdrawing group will make the carbanion most stable whereas an electron-donating group will make the carbanion the least stable.
In the options, all the para substituents are electron-donating in nature. All the groups attached here show +M effect, but CH3 group shows the least +M effect as compared to other groups attached here.
Therefore, option (d) structure has the most stable carbanion.
The stability of carbanion depends upon the nature of group at the para position. An electron-withdrawing group will make the carbanion most stable whereas an electron-donating group will make the carbanion the least stable.
In the options, all the para substituents are electron-donating in nature. All the groups attached here show +M effect, but CH3 group shows the least +M effect as compared to other groups attached here.
Therefore, option (d) structure has the most stable carbanion.
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