Question

Assertion Alkynes are more reactive towards nucleophilic addition reaction as compared to alkenes.
Reason Alkynes contain two pi bonds, while alkenes have only one bond.

• A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
• B. If both Assertion and Reason: are true but the Reason is not the correct explanation of the Assertion
• C. If Assertion is true but Reason is false
• D. If both Assertion and Reason are false

Answer 1

Answer: (B)

Although there are more $\pi$ electrons associated with the triple bond, the $sp$ hybridised carbon exert a strong attraction for these $\pi$ electrons which are consequently bound more tightly to the functional group than are the $\pi$ electrons of a double bond. Hence, a nucleophile attack more readily on triple bonded carbon atom.