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(A) The stability of an alkene is directly proportional to the number of hyperconjugative structures (number of $\alpha$-hydrogens).$1$. $(II) CH_3CH_

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$(II) < (IV) < (III) < (I)$

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(A) The stability of an alkene is directly proportional to the number of hyperconjugative structures (number of $\alpha$-hydrogens).$1$. $(II) CH_3CH_2CH_2CH = CH_2$: $2 \ \alpha$-hydrogens (monosubstituted).$2$. $(IV) CH_3CH_2C(CH_3) = CH_2$: $5 \ \alpha$-hydrogens (disubstituted).$3$. $(III) (CH_3)_2C = CHCH_3$: $7 \ \alpha$-hydrogens (trisubstituted).$4$. $(I) (CH_3)_2C = C(CH_3)_2$: $12 \ \alpha$-hydrogens (tetrasubstituted).Since stability increases with the number of $\alpha$-hydrogens,the order is $(II) < (IV) < (III) < (I)$.

Give the increasing order of stability for the following alkenes based on their heat of hydrogenation $(\Delta H^o)$:
$(I) (CH_3)_2C = C(CH_3)_2$
$(II) CH_3CH_2CH_2CH = CH_2$
$(III) (CH_3)_2C = CHCH_3$
$(IV) CH_3CH_2C(CH_3) = CH_2$

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Give the increasing order of stability for the following alkenes based on their heat of hydrogenation $(\Delta H^o)$:$(I) (CH_3)_2C = C(CH_3)_2$$(II) CH_3CH_2CH_2CH = CH_2$$(III) (CH_3)_2C = CHCH_3$$(IV) CH_3CH_2C(CH_3) = CH_2$