Q. 3-hydroxybutanal is formed when (X) reacts with (Y)in dilute (Z) solution. What are X, Y and Z? X Y Z
A) $CH_{3}CHO,\ \ \ \ \ \ \ \left( CH_{3} \right)_{2}CO,\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ NaOH$
B) $CH_{3}CHO,\ \ \ \ \ \ \ \ \ CH_{3}CHO,\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ NaCl$
C) $\left( CH_{3} \right)_{2}CO,\ \ \ \ \ \ \ \ \left( CH_{3} \right)_{2}CO,\ \ \ \ \ \ \ \ \ \ \ \ \ HCl$
D) $CH_{3}CHO,\ \ \ \ \ \ \ \ \ CH_{3}CHO,\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ NaOH$
Explanation
(d)
Aldehydes having $\alpha -$H-atoms undergoes aldol condensation in the presence of dil.$NaOH\$and yield $\beta -$hydroxy aldehydes.
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ OH$
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$CH_{3}CHO + CH_{3}CHO\overset{\ \ \ NaOH\ \ \ \ }{\rightarrow}CH_{3}CH.CH_{2}CHO$
3-hydroxy butanal
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.