Question

Assertion :Propyne is more reactive than propene towards electrophilic addition of $HBr$ Reason: Propyne has greator electron density avaliable for electrophile due to two pi-bonds, therefore more electrophilic

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is D Both Assertion and Reason are incorrect

Propyne forms less stable vinylic carbocation while propene forms more stable alkyl carbocation. Hence,
propyne is less reactive than propene towards electrophilic addition of HBr. Thus, both Assertion and Reason are incorrect.