Answer:
In alkyl substituted alkene, the \[\alpha
\]-hydrogen atoms of the methyl group are involved in the hyper conjugation
with the pi\[(\pi )\] electron pair of the double bond. As a result, the
stability of alkene increases. Greater the number of such groups more will be
the stability of alkene. Thus, the relative order of stability of the following
alkenes is:
\[\underset{\text{But-2-ene}}{\mathop{C{{H}_{3}}-CH}}\,=CH-C{{H}_{3}}>\underset{\text{Propene}}{\mathop{C{{H}_{3}}}}\,-CH\]\[=C{{H}_{2}}>\underset{\text{Ethene}}{\mathop{C{{H}_{2}}}}\,=C{{H}_{2}}\]
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