Which of the following is the most stable?

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(D) The stability of alkenes is determined by the number of alkyl groups attached to the double-bonded carbon atoms (hyperconjugation effect).$1-$bute

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$2-$pentene

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(D) The stability of alkenes is determined by the number of alkyl groups attached to the double-bonded carbon atoms (hyperconjugation effect).$1-$butene $(CH_3-CH_2-CH=CH_2)$ has $1$ alkyl group.$2-$butene $(CH_3-CH=CH-CH_3)$ has $2$ alkyl groups.$1-$pentene $(CH_3-CH_2-CH_2-CH=CH_2)$ has $1$ alkyl group.$2-$pentene $(CH_3-CH_2-CH=CH-CH_3)$ has $2$ alkyl groups.Among the options,$2-$pentene is the most stable because it has a higher degree of substitution compared to $1-$butene and $1-$pentene,and the alkyl groups provide greater stabilization through hyperconjugation compared to $2-$butene due to the longer chain length.

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