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Properties of Oxygen

If the dissoc...

Question

If the dissociation energy of $C H_{4}$ is $368 kcal/mol$ and that of $C_{2} H_{6}$ is $628 kcal/mol$ , then calculate the bond energy of $C - C$ bond in $kcal/mol$ :

A

86

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B

92

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C

76

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D

120

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Solution

The correct option is C 76
Dissociation energy of $C H_{4}$
$= 368 kcal/mol$
$∴ C - H$ bond energy $= \frac{Dissociation Energy of C H_{4}}{Number of Bonds}$
$= \frac{368}{4} = 92 kcal/mol$
$∴ C - C$ bond energy
$= dissociation energy of C_{2} H_{6} - bond energy of 6 (C - H)$
$= 628 - 6 \times 92$
$= 628 - 552 = 76 kcal/mol$

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