A) \[C{{H}_{3}}CHO\]
B) \[C{{H}_{3}}C{{H}_{2}}CHO\]
C) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,HCHO\]
D) \[HCHO\]
Correct Answer: D
Solution :
Aldehydes undergo nucleophilic addition reaction. Among carbonyl compounds reactivity decreases with increase in number of alkyl groups as these groups decrease the polarity of\[>C=O\]bond. (a)\[C{{H}_{3}}-\overset{\begin{smallmatrix} O \\ |\,\,| \end{smallmatrix}}{\mathop{C}}\,-H\] (b)\[C{{H}_{3}}-C{{H}_{2}}-\overset{\begin{smallmatrix} O \\ |\,\,| \end{smallmatrix}}{\mathop{C}}\,-H\] (c)\[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,H-\overset{\begin{smallmatrix} O \\ |\,\,| \end{smallmatrix}}{\mathop{C}}\,-H\] (d)\[H-\overset{\begin{smallmatrix} O \\ |\,\,| \end{smallmatrix}}{\mathop{C}}\,-H\] \[\because \]formaldehyde \[(HCHO)\] has least \[(no)\] alkyl group. It gives nucleophilic addition most easily.
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