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  4. Assertion: 2,3-Dimethylbut-2-ene is more stable than but-2-ene. Reason: Six hyperconjugation structures can be written for 2, 3-dimethylbut-2-ene while but- 2-ene has twelve.

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Q. Assertion : 2,3-Dimethylbut-2-ene is more stable than but-2-ene.
Reason : Six hyperconjugation structures can be written for 2, 3-dimethylbut-2-ene while but- 2-ene has twelve.

AIIMSAIIMS 2010Organic Chemistry – Some Basic Principles and Techniques

Solution:

Greater the number of hyperconjugating structures, greater is the stability of the compound.