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(C) The reactivity of carbonyl compounds towards nucleophilic addition reactions depends on two factors: steric hindrance and electronic effects.Aldeh

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$I > II > III$

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(C) The reactivity of carbonyl compounds towards nucleophilic addition reactions depends on two factors: steric hindrance and electronic effects.Aldehydes are generally more reactive than ketones because they have less steric hindrance and less electron-donating alkyl groups attached to the carbonyl carbon.In $HCHO$,there are two hydrogen atoms attached to the carbonyl carbon,providing the least steric hindrance.In $CH_3CHO$,one methyl group is present,which increases steric hindrance and provides a $+I$ effect.In $CH_3COCH_3$,two methyl groups are present,providing the maximum steric hindrance and the strongest $+I$ effect,which decreases the electrophilicity of the carbonyl carbon.Therefore,the order of reactivity is $I > II > III$.

Column-$I$	Column-$II$
$A$. Acetophenone and Benzophenone	$P$. $NaHCO_3$
$B$. Phenol and Benzoic acid	$Q$. $NaHSO_3$
$C$. Propanone and Ethanal	$R$. $I_2 / NaOH$
$D$. Acetone and Acetophenone	$S$. Fehling solution

Arrange the following compounds in the decreasing order of their reactivity towards nucleophilic addition reactions:
$(I) \, HCHO \, (II) \, CH_3CHO \, (III) \, CH_3COCH_3$

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$A$. Acetophenone and Benzophenone $P$. $NaHCO_3$

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Arrange the following compounds in the decreasing order of their reactivity towards nucleophilic addition reactions:$(I) \, HCHO \, (II) \, CH_3CHO \, (III) \, CH_3COCH_3$