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(A) The stability of alkenes is directly proportional to the number of $\alpha$-hydrogen atoms (hyperconjugation) and steric factors.$V$ (Ethene): $CH

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$V < I < II < III < IV$

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(A) The stability of alkenes is directly proportional to the number of $\alpha$-hydrogen atoms (hyperconjugation) and steric factors.$V$ (Ethene): $CH_2=CH_2$ $(0 \ \alpha-H)$$I$ (Propene): $CH_3-CH=CH_2$ $(3 \ \alpha-H)$$II$ (cis-but-$2$-ene): $CH_3-CH=CH-CH_3$ ($6 \ \alpha-H$,less stable due to steric hindrance)$III$ (trans-but-$2$-ene): $CH_3-CH=CH-CH_3$ ($6 \ \alpha-H$,more stable due to less steric hindrance)$IV$ ($2,3$-dimethylbut-$2$-ene): $(CH_3)_2C=C(CH_3)_2$ $(12 \ \alpha-H)$Increasing order of stability: $V < I < II < III < IV$.

Arrange the following according to the increasing order of stability: Propene $(I)$,cis-but-$2$-ene $(II)$,trans-but-$2$-ene $(III)$,$2,3$-dimethylbut-$2$-ene $(IV)$,ethene $(V)$.

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