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Q.

Enthalpy of atomization of $C_{2} H_{6} (g)$ and $C_{3} H_{8} (g)$ are 620 and $880 k J m o l^{- 1}$ respectively. The $C - C$ and $C - H$ bond energies are respectively :

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a

$70 and 90 kJ {mol}^{- 1}$

b

$100 and 8 0 kJ {mol}^{- 1}$

c

$80 and 90 kJ {mol}^{- 1}$

d

$80 a n d 60 k J m o l^{- 1}$

answer is B.

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Detailed Solution

Let $C - CB . E . = x, C - HB \cdot E . = y$

$x + 6 y = 620 and 2 x + 8 y = 880$

$y = 90, x = 80$

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