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Introduction to Electrophilic Substitution

why is benzal...

Question

why is benzaldehyde less reactive than propanal in nucleophilic addition rxn?

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Solution

The carbon atom of the carbonyl group of benzaldehyde is less electrophilic than carbon atom of the carbonyl group present in propanal. The polarity of the carbonylgroup is reduced in benzaldehyde due to resonance hence it is less reactive than propanal

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Propanone is less reactive than ethanal towards nucleophilic addition reactions.

Q. Arrange the following compounds in increasing order of their reactivity in nucleophilic in nucleophili addition reaction:
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(ii) Benzaldehyde,

p -

p -

Nitrobenzeldehyde, Acetophenone.

Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions.

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Hint: Consider steric effect and electronic effect.

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