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As far as I know, alkenes with more number of hyperconjugating structures are more stable. Hyperconjugation has a greater stablizing effect than Inductive effect. So, (d) should be more stable as it has more number of alpha-hydrogens. But answer in the book is given (c). Is the answer wrong? Or am I missing something.

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    $\begingroup$ Only sterics may be important here. $\endgroup$ – Mithoron Mar 23 at 20:43

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