Which of the following esters cannot undergo Claisen self condensation

1.	Which of the following esters cannot undergo Claisen self condensation [CBSE PMT 1998]
A.	\[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-COO{{C}_{2}}{{H}_{5}}\]
B.	\[{{C}_{6}}{{H}_{5}}COO{{C}_{2}}{{H}_{5}}\]
C.	\[{{C}_{6}}{{H}_{5}}C{{H}_{2}}COO{{C}_{2}}{{H}_{5}}\]
D.	\[{{C}_{6}}{{H}_{11}}C{{H}_{2}}COO{{C}_{2}}{{H}_{5}}\]
Answer» C. \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}COO{{C}_{2}}{{H}_{5}}\]

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Which of the following esters cannot undergo Claisen self condensation [CBSE PMT 1998]

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