A) \[C{{H}_{3}}-CH=CH-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-H\]
B) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-H\]
C) \[C{{H}_{3}}-CH=CH-COOH\]
D) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}-COOH\]
Correct Answer: A
Solution :
\[\underset{acetaldehyde}{\mathop{\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C{{H}_{3}}CH}}\,}}\,+H.C{{H}_{2}}CHO\xrightarrow[{}]{Dil.\,base}\] \[\underset{(X)}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}CHO}}\,\] \[\xrightarrow[\Delta ]{-{{H}_{2}}O}\underset{(Y)}{\mathop{C{{H}_{3}}CH}}\,=CH-CHO\] This is aldol condensation reaction.
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