How many alkenes, from the following, are more stable than trans-hex-2-ene ?
(i) (ii) (iii)
(iv) (v) (vi)
(vii) (viii) (ix)

Question

How many alkenes, from the following, are more stable than trans-hex-2-ene ? (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix)

TestHub · Accepted Answer

Stability of an alkene rises with the number of alkyl groups on the $C = C$ (more hyperconjugation).

Trans-hex-2-ene is 1,2-disubstituted. More stable: the trisubstituted (ii), (v), (vii) and the tetrasubstituted (iv), (ix).

Not more stable: (i) the cis isomer (steric strain), (iii) monosubstituted, and the 1,1-disubstituted (vi) and (viii), which are slightly less stable than a trans 1,2-disubstituted alkene.

Total = 5.

Answer: 5.

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