MCQ
The effect that makes $2,3-$ dimethyl $-2-$ butene more stable than $2-$ butene is
- AResonance
- ✓Hyperconjugation
- CSteric effect
- DInductive effect
✓
Answer
Correct option: B.
Hyperconjugation
b
Stability $\propto$ Hyperconjugation $\propto$ No. of $\alpha-H$
Stability $\propto$ Hyperconjugation $\propto$ No. of $\alpha-H$
$\underset{\begin{smallmatrix}
12\,\alpha -Hydrogen \\
More\,hyperconjugation
\end{smallmatrix}}{\mathop{\begin{matrix}
\,\,\,\,\,\,\,\overset{\alpha }{\mathop{C}}\,{{H}_{3}}\overset{\,\alpha }{\mathop{\,C}}\,{{H}_{3}} \\
\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\, \\
\overset{\alpha }{\mathop{C}}\,{{H}_{3}}-C=C-\underset{\alpha }{\mathop{C}}\,{{H}_{3}} \\
\end{matrix}}}\,$ $\underset{\begin{smallmatrix}
6\,\alpha -Hydrogen \\
Less\,Hyperconjugation
\end{smallmatrix}}{\mathop{\overset{\alpha }{\mathop{C}}\,{{H}_{3}}-CH=CH-\overset{\alpha }{\mathop{C}}\,{{H}_{3}}}}\,$
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