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(A) The reactivity of carbonyl compounds towards nucleophilic addition reactions like $HCN$ addition depends on two factors: steric hindrance and elec

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$III < IV < II < I$

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(A) The reactivity of carbonyl compounds towards nucleophilic addition reactions like $HCN$ addition depends on two factors: steric hindrance and electronic effects.$1$. Steric hindrance: As the size of the alkyl groups attached to the carbonyl carbon increases,the approach of the nucleophile $(CN^-)$ becomes more difficult,decreasing reactivity.$2$. Electronic effect: Alkyl groups are electron-donating ($+I$ effect),which decreases the electrophilicity of the carbonyl carbon,thereby decreasing reactivity.Comparing the compounds:$I$. Acetaldehyde $(CH_3CHO)$: Least steric hindrance,most reactive.$II$. Acetone $(CH_3COCH_3)$: More steric hindrance than acetaldehyde.$III$. Di-tert-butyl ketone $((CH_3)_3CCO C(CH_3)_3)$: Extremely high steric hindrance,least reactive.$IV$. Methyl-tert-butyl ketone $((CH_3)_3CCOCH_3)$: More steric hindrance than acetone but less than di-tert-butyl ketone.Thus,the order of increasing reactivity is: $III < IV < II < I$.

Arrange the following compounds in increasing order of their reactivity towards $HCN$:
$I$. Acetaldehyde
$II$. Acetone
$III$. Di-tert-butyl ketone
$IV$. Methyl-tert-butyl ketone

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Arrange the following compounds in increasing order of their reactivity towards $HCN$:$I$. Acetaldehyde$II$. Acetone$III$. Di-tert-butyl ketone$IV$. Methyl-tert-butyl ketone