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Introduction to E2 Mechanism

Write the inc...

Question

Write the increasing order of reactivity towards the nucleophilic addition reactions.

CH $_{3}$ CHO, C $_{6}$ H $_{5}$ COC $_{6}$ H $_{5}$ , CH $_{3}$ COC $_{6}$ H $_{5}$ , CH $_{3}$ COCH $_{3}$

_{3}

CHO < CH

_{3}

COCH

_{3}

< CH

_{3}

COC

_{6}

_{5}

< C

_{6}

_{5}

COC

_{6}

_{5}

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_{6}

_{5}

COC

_{6}

_{5}

< CH

_{3}

COC

_{6}

_{5}

< CH

_{3}

COCH

_{3}

< CH

_{3}

CHO

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_{6}

_{5}

COC

_{6}

_{5}

< CH

_{3}

CHO < CH

_{3}

COCH

_{3}

< CH

_{3}

COC

_{6}

_{5}

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_{3}

COCH

_{3}

< CH

_{3}

COC

_{6}

_{5}

< C

_{6}

_{5}

COC

_{6}

_{5}

< CH

_{3}

CHO

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Solution

The correct option is C C $_{6}$ H $_{5}$ COC $_{6}$ H $_{5}$ < CH $_{3}$ COC $_{6}$ H $_{5}$ < CH $_{3}$ COCH $_{3}$ < CH $_{3}$ CHO
The order of increasing reactivity towards nucleophilic addition reactions is C $_{6}$ H $_{5}$ COC $_{6}$ H $_{5}$ < CH $_{3}$ COC $_{6}$ H $_{5}$ < CH $_{3}$ COCH $_{3}$ < CH $_{3}$ CHO.

Aldehydes are more reactive than aliphatic ketones. Aliphatic ketones are more reactive than aromatic ketones.

Thus benzophenone is least reactive and acetaldehyde is most reactive towards nucleophilic addition reactions.

Hence, the correct option is B.

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Write the increasing order of reactivity towards the nucleophilic addition reactions. CH3CHO, C6H5COC6H5, CH3COC6H5, CH3COCH3

Write the increasing order of reactivity towards the nucleophilic addition reactions.

CH $_{3}$ CHO, C $_{6}$ H $_{5}$ COC $_{6}$ H $_{5}$ , CH $_{3}$ COC $_{6}$ H $_{5}$ , CH $_{3}$ COCH $_{3}$