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 but2 -ene has twelve.

• A

  If both assertion and reason are true and reason is the correct explanation of assertion
• B

  If both assertion and reason are true but reason is not the correct explanation of assertion
• Correct answer
  C

  If assertion is true but reason is false
• D

  If both assertion and reason are false.

Hence, the correct answer is option: 'C'.