General Organic ChemistryMedium

Question

Among the given compounds I-III, the correct order of bond dissociation energy of C-H bond marked with * is:

Options

A.II $>$ I $>$ III
B.I $>$ II $>$ III
C.III $>$ II $>$ I
D.II $>$ III $>$ I

Solution

Sol. [Key Concept: Order of C–H bond dissociation energy with hybridisation (sp > sp² > sp³)]

I. carbon of this bond is $sp^{2}$ hybridised

II. carbon of this bond is $sp$ hybridised

III. carbon of this bond is sp3 hybridised

Higher the percentage s character, stronger is $C - H$ bond. Correct order of bond dissociation energy of $C - H$ bond:

II $>$ I $>$ III

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