Which of the following is the least reactive towards a nucleophile?
A
Methanal
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B
Propanal
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C
3-Pentanone
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D
2-Pentanone
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Solution
The correct option is C 3-Pentanone Electrophilicity of carbonyl carbon is decreased by electron donating group present on it. Nucleophile attacks on the crabonyl carbon bearing more positive charge. In 3-pentanone, ethyl groups decrease the partial positive charge on crbonyl carbon and rate is diminished.