JEE Main 2026 Apr 5 Shift 2, Chemistry Q13: Properties of Alkenes

JEE Main2026Apr 5, Shift 2Chemistry

IUPAC name of some alkenes are given below. Find out the correct stability order.

A. 2-Methylbut-2-ene

B. cis-But-2-ene

C. 2,3-Dimethylbut-2-ene

D. Prop-1-ene

Choose the correct answer from the options given below:

Solution

Alkene stability increases with the number of alkyl substituents on the C=C (more hyperconjugation, more $α$ -hydrogens).

Counting substitution at the double bond:

C. 2,3-Dimethylbut-2-ene — tetrasubstituted (12 $α$ -H)

A. 2-Methylbut-2-ene — trisubstituted (9 $α$ -H)

B. cis-But-2-ene — disubstituted (6 $α$ -H)

D. Prop-1-ene — monosubstituted (3 $α$ -H)

$∴$ C $>$ A $>$ B $>$ D.

Concept behind this question

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