Assertion : Addition of $\mathrm{HBr}$ on 2-butene gives two isomeric products. Reason : Addition of $\mathrm{HBr}$ on 2-butene follows Markovnikov's rule.

• A

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

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

  If assertion is true, but reason is false
• Correct answer
  D

  Both assertion and reason are false statements.

Solution

Addition of $\mathrm{HBr}$ on 2-butene gives only one product, 2-bromobutane.
As 2-butene is a symmetrical alkene, it does not follow Markownikoff's rule.

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