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# Which of the following is a pair of functional isomers?

$\begin {array} {1 1} (a)\;CH_3COCH_3,CH_3CH_O \\ (b)\;C_2CH_5CO_2H,CH_3CO_2CH_3 \\ (c)\;C_2H_5CO_2H,CHCO_2C_2H_5 & \\ (d)\;CH_3CO_2,CH_3CHO \end {array}$