General Organic ChemistryMedium

Question

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:

Options

A.C $>$ A $>$ B $>$ D
B.C $>$ A $>$ D $>$ B
C.B $>$ D $>$ A $>$ C
D.A $>$ B $>$ C $>$ D

Solution

Sol. [Key Concept: Stability of an alkene is proportional to the number of $\alpha$-hydrogens (hyperconjugation), so count them for each structure and order accordingly.]

Stability of alkene $\propto$ Number of $\alpha$ hydrogen.

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