Q. A compound $X\$undergoes reduction with $LiAlH_{4}$ to yield $Y$. When vapours of $Y$ are passed over freshly reduced copper at 300^{0}C, $X$ is formed. What is $Y$?
A) $CH_{3}COCH_{3}$
B) $CH_{3}CHO$
C) $CH_{3}CH_{2}OH$
D) $CH_{3}OCH_{3}$
Explanation
(c)
Aldehydes are reduced by $LiAIH_{4}$ to alcohols and alcohols are oxidised by copper to give aldehydes.
$CH_{3}CHO\overset{LiAIH_{4}}{\rightarrow}CH_{3}CH_{2}OH\underset{\mathrm{\Delta}}{\overset{\ \ \ \ Cu\ \ \ \ }{\rightarrow}}CH_{3}CHO$
(X) (Y) (X)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.