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Q.
Which one of the following can be converted to $CH_{3}CH=CHCHO$ ?
J & K CETJ & K CET 2002
Solution:
Acetaldehyde undergoes aldol condensation to form aldol which gives
$CH _{3} CH = CHCHO$ on heating. $\underset{\text{acetaldehyde}}{CH _{3} CHO} + H \cdot \overset{\alpha}{CH _{2}} CHO$
