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Question

For the reactions,
I.CH4(g)C(g)+4H(g);ΔH=x1
II.C2H6(g)2C(g)+6H(g);ΔH=x2from I and II, bond energy of C - C bond is:

A
x1+x2
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B
x2x1
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C
x2+1.5x1
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D
x21.5x1
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Solution

The correct option is C x21.5x1
(i)CH4(g)C(g)+4H(g);ΔH=xforfourCHbonds
BE of (CH) bond =x14
(ii)C2H6(g)2c(g)+6H(g)
ΔH=x2=(BE)cc+6×(BE)CH
x2=BECC+×x14
(BE)CC=x21.5x1

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