Question

Decreasing order of reactivity towards nucleophilic addition
to carbonyl group among cyclopentanone, 3-pentanone and
n-pentanal is
(a) 3-pentanone, cyclopentanone, n-pentanal
(b) n-pentanal, 3-pentanone, cyclopentanone
(c) n-pentanal, cyclopentanone, 3-pentanone
(d) cyclopentanone, 3-pentanone, n-pentanal

Answer 1

Explanation:

3-pentanone, cyclopentanone, n-pentanal is your answer mate

Answer 2

n-pentanal, cyclopentanone, 3-pentanone is the order of nucleophilic addition.

Explanation:

• The nucleophilic addition is the type of addition where an electron rich species or namely a nucleophile attacks an electron deficient center of a molecule and corresponding addition takes place.

• The nucleophilic addition in carbonyl groups is generally very preferred because of the electron deficient character of the carbonyl carbons.

• Because of the inductive effect of the alkyl chains, the ketones are less reactive towards nucleophilic addition than aldehydes.

• In case of cyclic ketones and that of the alkyl ketones, the cyclic ketones are at much angular strain than alkyl ketones.

• So cyclic ketones are more reactive towards nucleophilic addition than alkyl ketones.

• So the final rate in decreasing order is n-pentanal, cyclopentanone, 3-pentanone.

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