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101.

The `C-C` distance in ethane isA. `154 "pm"`B. `139 "pm"`C. `134"pm"`D. `120 "pm"`

Answer» Correct Answer - C
The `C=C` bonds of alkenes are stronger than the `C-C` bonds of alkanes. Stronger bonds have shorter bond lengths. In the stronger `C=C` bond, `4` electrons shield the bonding carbon atoms permitting closer approach to their positively charged nuclei than in the `C-C` bond shielded by only two electrons.
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