A compound possessing `alpha`-hydrogen atom, in the presence of dilute alkali forms `beta`-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound is
A. `CH_(3)CHO`
B. `CH_(3)CH_(2)CHO`
C. `CH_(2)=CH-CHO`
D. `HC=C-CHO`

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Correct Answer - A
See aldol condensation in the reactions of aldehydes and ketones.

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