A) \[C{{H}_{3}}CH_{2}^{-}\]
B) \[HC\equiv {{C}^{-}}\]
C) \[{{({{C}_{6}}{{H}_{5}})}_{3}}{{C}^{-}}\]
D) \[CH_{3}^{-}\]
E) \[{{(C{{H}_{3}})}_{3}}{{C}^{-}}\]
Correct Answer: E
Solution :
An organic ion with a pair of available electrons and a negative charge on the central carbon atom is called a carbanion. Electron attracting group\[(-CN,>C=O)\] increases stability and electron releasing group (\[-C{{H}_{3}}\]etc) decreases the stability of carbanion. In\[{{(C{{H}_{3}})}_{3}}{{C}^{-}},\]three\[-C{{H}_{3}}\]groups (electron releasing group) are present, so it is least stable.
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