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Which one of the following esters cannot undergo self Claisen condensation?
A. `CH_3CH_2CH_2CH_2COOC_2H_5`
B. `C_6H_5COOC_2H_5`
C. `C_6H_5CH_2COOC_2H_5`
D. `C_6H_11 CH_2 COOC_2H_5`

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Correct Answer - B
The ester which contains `alpha` hydrogen atom undergoes Claisen-self condensation :
image

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