Question

Which among the following compounds is most stable
A) Ethene
B) 1-butene
C) cis-2-butene
D) 2, 3-dimethyl but-2-ene
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Answer 1

Answer:

2,3 dimethyl but-2-ene

Explanation:

due to hyperconjugation

Answer 2

The correct option is D.

• As the number of alpha hydrogen increases the hyperconjugation increases and the stability of the compound increases.
• As from the above structures ethene has no alpha hydrogen. So, least stable.
• 1-butene has two alpha hydrogens.
• cis-2-butene has six alpha hydrogen.
• 2,3-dimethyl but-2-ene has 12 alpha hydrogens so it is most stable.
• Thus 2, 3-dimethyl but-2-ene is most stable.