Which of the following aldehydes is most reac | vedclass

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(A) The reactivity of carbonyl compounds towards nucleophilic addition depends on the steric hindrance and electronic effects around the carbonyl carb

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$HCHO$

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(A) The reactivity of carbonyl compounds towards nucleophilic addition depends on the steric hindrance and electronic effects around the carbonyl carbon.$HCHO$ (formaldehyde) has two hydrogen atoms attached to the carbonyl carbon,which provides minimum steric hindrance.Alkyl groups (like $-CH_3$ or $-C_2H_5$) are electron-donating due to the $+I$ (inductive) effect,which decreases the electrophilicity of the carbonyl carbon.Since $HCHO$ has no alkyl groups,it is the most electrophilic and thus the most reactive towards nucleophilic addition.$CH_3COCH_3$ is a ketone,which is generally less reactive than aldehydes due to both steric and electronic factors.

Column $I$	Column $II$
$A$. $C_6H_5CHO$	$p$. gives precipitate with $2, 4-$dinitrophenylhydrazine
$B$. $CH_3C \equiv CH$	$q$. gives precipitate with $AgNO_3$
$C$. $CN^{-}$	$r$. is a nucleophile
$D$. $I^{-}$	$s$. is involved in cyanohydrin formation

Which of the following aldehydes is most reactive towards nucleophilic addition reactions?

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