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Question

The dissociation energy of CH4 is 400 Kcal mol1 and that of ethane is 670 Kcal mol1. The C - C bond energy is.

A

270 kcal

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B

70 kcal

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C

200 kcal

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D

240 kcal

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Solution

The correct option is B

70 kcal


CH4 has 4 C - H bonds
Energy needed to break a single C - H bond is 4004= 100 Kcal
C2H6 has 6 C - H bonds
The C - C bond energy can be given by

​670 Kcal - 6 × 100 Kcal = 70 Kcal

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