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# Select the molecule which has only one $\pi$-bond

$\begin{array}{1 1}(a)\;CH_3COCH_3\\(b)\;CH_2=CH-CHO\\(c)\;CH_3-CH=CH-CHO\\(d)\;\text{above all}\end{array}$

$CH_3COCH_3$ contain only one $\pi$-bond
Hence (a) is the correct answer.