question_answer

\[C{{H}_{3}}CHO+C{{H}_{3}}MgBr\xrightarrow[{}]{{}}A\] Compound A, is

A)  a perimary alcohol

B)  a secondary alcohol

C)  a tertiary alcohol

D)  \[C{{H}_{3}}-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\]

Correct Answer: B

Solution :

 Acetaldehyde gives isopropyi alcohol on hydrolysis with Grignard's reagent. Isopropyi alcohol is a secondary alcohol. \[\underset{acetaldehyde}{\mathop{C{{H}_{3}}-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-H}}\,+C{{H}_{3}}MgBr\xrightarrow[{}]{{}}C{{H}_{3}}-\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix}  OMgBr \\  | \end{smallmatrix}}{\mathop{C}}}\,-H\]