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Decreasing order of reactivity towards nucleophilic addition to carbonyl group among cyclopentanone, 3-pentanone and n-pentanal is

1. 3-pentanone, cyclopentanone, n-pentanal
2. n-pentanal, 3-pentanone, cyclopentanone
3. n-pentanal, cyclopentanone, 3-pentanone
4. cyclopentanone, 3-pentanone, n-pentanal

Correct answer: n-pentanal, cyclopentanone, 3-pentanone

Solution

Aldehydes (like n-pentanal) are more reactive than ketones due to less steric hindrance and greater electrophilicity. Among ketones, cyclopentanone is more reactive than 3-pentanone because of ring strain in the cyclic structure.

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