Question

The Keq values in HCN addition to following aldehydes are in the order:

Answer 1

Explanation:

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Keq=

[reactant]

[Product]

1. It has less positive resonance effect than NMe

2

hence has more Keq than III as Carbonyl inthis compound is more electrophilic than (III) compound.

2. Carbonyl groups more electrophilic than (I) and (III) Hence, readily reacts with HCN and has great Keq than (I) and (III)

3). NMe

2

has greater +R effect than −OMe, hence react to lesser extent than (I) and II Hence, has least Keq.

∴KeqII>I>III