A) \[\text{RCHO+R }\!\!'\!\!\text{ MaX}\xrightarrow[{}]{{}}\text{R}-\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ } \\ \text{OH} \end{smallmatrix}}{\mathop{\text{CH}}}\,-\text{R}\]
B) \[\text{C}{{\text{H}}_{\text{3}}}-\text{C}{{\text{H}}_{\text{2}}}-\overset{\begin{smallmatrix} \text{C}{{\text{H}}_{\text{3}}} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{CH}}}\,-\text{C}{{\text{H}}_{\text{2}}}\text{Br}\,\text{+}\,\text{N}{{\text{H}}_{\text{3}}}\xrightarrow[{}]{{}}\]\[\text{C}{{\text{H}}_{\text{3}}}-\text{C}{{\text{H}}_{\text{2}}}-\overset{\begin{smallmatrix} \text{C}{{\text{H}}_{\text{3}}} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{CH}}}\,-\text{C}{{\text{H}}_{\text{2}}}\text{N}{{\text{H}}_{2}}\]
C) \[\text{C}{{\text{H}}_{\text{3}}}\text{CHO}\,\text{+}\,\text{HCN}\xrightarrow[{}]{{}}\text{C}{{\text{H}}_{\text{3}}}\text{CH(OH)CN}\]
D) \[\text{C}{{\text{H}}_{\text{3}}}-\text{CH}\,\text{=}\,\text{C}{{\text{H}}_{\text{2}}}+{{\text{H}}_{\text{2}}}\text{O}\xrightarrow[{}]{{{\text{H}}^{\text{+}}}}\]\[\text{C}{{\text{H}}_{\text{3}}}-\underset{\begin{smallmatrix} | \\ \text{OH} \end{smallmatrix}}{\mathop{\text{CH}\,}}\,-\text{C}{{\text{H}}_{\text{3}}}\]
Correct Answer: B
Solution :
\[\text{RCHO}\,\text{+}\,\text{R }\!\!'\!\!\text{ }\,\text{MgX}\xrightarrow[\begin{smallmatrix} \text{(Nucleophilic} \\ \text{addition)} \end{smallmatrix}]{{}}\text{R}-\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ } \\ \text{OH} \end{smallmatrix}}{\mathop{\text{CH}}}\,-\text{R }\!\!'\!\!\text{ :}\] \[\text{C}{{\text{H}}_{\text{3}}}-\text{C}{{\text{H}}_{\text{2}}}-\overset{\begin{smallmatrix} \text{C}{{\text{H}}_{\text{3}}} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{CH}}}\,-\text{C}{{\text{H}}_{\text{2}}}\text{Br}\,\text{+}\,\text{N}{{\text{H}}_{\text{3}}}\xrightarrow[\begin{smallmatrix} \text{(Nucleophilic} \\ \text{substitution)} \end{smallmatrix}]{{}}\]\[\text{C}{{\text{H}}_{\text{3}}}-\text{C}{{\text{H}}_{\text{2}}}-\overset{\begin{smallmatrix} \text{C}{{\text{H}}_{\text{3}}} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{CH}}}\,-\text{C}{{\text{H}}_{\text{2}}}\,\text{N}{{\text{H}}_{2}}\] \[\text{C}{{\text{H}}_{\text{3}}}\text{CHO}\,\text{+}\,\text{HCN}\xrightarrow[\begin{smallmatrix} \text{(Nucleophilic} \\ \text{addition)} \end{smallmatrix}]{{}}\text{C}{{\text{H}}_{\text{3}}}\text{CH(OH)CN}\]\[\text{C}{{\text{H}}_{\text{3}}}-\text{CH}\,\text{=}\,\text{C}{{\text{H}}_{\text{2}}}+{{\text{H}}_{\text{2}}}\text{O}\xrightarrow[\begin{smallmatrix} \text{(Nucleophilic} \\ \text{addition)} \end{smallmatrix}]{{{\text{H}}^{\text{+}}}}\] \[\text{C}{{\text{H}}_{\text{3}}}-\underset{\begin{smallmatrix} | \\ \text{OH} \end{smallmatrix}}{\mathop{\text{CH}}}\,-\text{CH}{{\,}_{3}}\]
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