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The order of decreasing C - C bond lengths in the following molecules(i) C2H4(ii) C2H2(iii) C6H6(iv) C2H6

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a

iv > iii > i > ii

b

i > ii > iii > iv

c

iv > i > ii > iii

d

iv > ii > i > iii

answer is A.

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Detailed Solution

C−C→1.54A C=C→in⁡C2H41.36AC≡C→1.20AC6H6,bond length is 1.39A due to resonance.

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