The increasing order of the following compoun | vedclass

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(A) The reactivity of carbonyl compounds towards nucleophilic addition of $HCN$ depends on the electrophilicity of the carbonyl carbon and steric hind

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$(iii) < (i) < (iv) < (ii)$

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(A) The reactivity of carbonyl compounds towards nucleophilic addition of $HCN$ depends on the electrophilicity of the carbonyl carbon and steric hindrance. Electron-withdrawing groups ($-I$ or $-R$ effect) increase the electrophilicity of the carbonyl carbon,thereby increasing reactivity. Electron-donating groups ($+R$ or $+I$ effect) decrease the electrophilicity,thereby decreasing reactivity.$(i)$ $m$-Methoxybenzaldehyde: $-OCH_3$ group shows $-I$ effect (electron-withdrawing) from the meta position.(ii) $o$-Nitrobenzaldehyde: $-NO_2$ group shows both $-I$ and $-R$ effects (strong electron-withdrawing).(iii) $o$-Methoxybenzaldehyde: $-OCH_3$ group shows $+R$ effect (strong electron-donating) from the ortho position.(iv) $m$-Nitrobenzaldehyde: $-NO_2$ group shows only $-I$ effect from the meta position.Comparing the effects:- (iii) has a strong electron-donating group $(+R)$,making it the least reactive.- $(i)$ has a weak electron-withdrawing group $(-I)$.- (iv) has a stronger electron-withdrawing group ($-I$ only).- (ii) has the strongest electron-withdrawing effect ($-I$ and $-R$),making it the most reactive.Thus,the increasing order of reactivity is: $(iii) < (i) < (iv) < (ii)$.

The increasing order of the following compounds towards $HCN$ addition is:

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