Which of the following esters cannot undergo Claisen self-condensation?

  • A
    $CH_3-CH_2-CH_2-CH_2-COOC_2H_5$
  • B
    $C_6H_5COOC_2H_5$
  • C
    $C_6H_5CH_2COOC_2H_5$
  • D
    $C_6H_{11}CH_2COOC_2H_5$

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