Alcohols Phenols And Ethers Question 210
Question: When ethanal reacts with $ CH_3MgBr $ and $ C_2H_5OH $ /dry HCl the product formed are
[DCE 2003]
Options:
A) Ethyl alcohol and 2-propanol
B) Ethane and hemi-acetal
C) 2-propanol and acetal
D) Propane and methyl acetate
Show Answer
Answer:
Correct Answer: C
Solution:
Ethanal with $ CH_3MgBr $ gives propanol-2 (after hydrolysis) and with $ C_2H_5OH $ , it gives acetal. $ \underset{Acetaldehyde}{\mathop{CH_3CHO}}+CH_3MgBr\to CH_3CH<\begin{matrix} OMgBr \\ CH_3\ \ \ \\ \end{matrix}\xrightarrow{{H^{+}}} $
$ \underset{\text{2 propanol}}{\mathop{CH_3CH<\begin{matrix} OH\ \\ CH_3 \\ \end{matrix}}} $
$ CH_3CHO+2C_2H_5OH\xrightarrow{\text{dry }HCl}\underset{Acetal}{\mathop{CH_3CH<\begin{matrix} OC_2H_5 \\ OC_2H_5 \\ \end{matrix}}} $
BETA
