question_answer

Which among the following compounds will give a secondry alcohol on reacting with Grignard reagent followed by acid hydrolysis? I. HCHO                                II. \[{{C}_{2}}{{H}_{5}}CHO\] III.\[\text{C}{{\text{H}}_{\text{3}}}\text{COC}{{\text{H}}_{\text{3}}}\]                  IV. \[RCOO{{C}_{2}}{{H}_{5}}\] Select the correct answer using the codes given below.

A) Only II                                  

B) Only III 

C) II and IV              

D) III and IV

Correct Answer: C

Solution :

\[{{C}_{2}}{{H}_{5}}CHO+RMgX\xrightarrow{{}}{{C}_{2}}{{H}_{5}}-\underset{\begin{smallmatrix}  | \\  R \end{smallmatrix}}{\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{C}}}\,-OMgX\] \[RCOO{{C}_{2}}{{H}_{5}}+RMgX\to H-\underset{\begin{smallmatrix}  | \\  R \end{smallmatrix}}{\overset{\begin{smallmatrix}  O{{C}_{2}}{{H}_{5}} \\  | \end{smallmatrix}}{\mathop{C}}}\,-OMgX\]