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  4. Which o f the following molecules has longest C = C length?

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Q. Which o f the following molecules has longest $C = C$ length?

Organic Chemistry – Some Basic Principles and Techniques

Solution:

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Due to Hyperconjugation single bond character aries in double bond so bond length increase

$B.L.$ of double bond $\propto$ no. of $\propto$ Hatoms $\propto$ hyperconjuation