Question

Identify the incorrect statement/statements:
(i) Alkynes are more reactive than alkenes towards electrophilic addition reaction
(ii) Alkynes are less reactive than alkenes towards electrophilic addition reaction
(iii) Alkynes decolourise $Br_{2}$ water
(iv) Addition of $HBr$ to alkynes in presence of peroxide proceeds via Markownikoff's rule .

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (i) and (iv)
• D. (ii) and (iv)

Answer 1

Answer: (C)

More is the s-character more is its electrophilic nature out of alkenes and alkyne.

Thus alkynes are more reactive than alkenes towards nucleophilic reaction and less reactive towards the electrophilic reaction.
Addition of $HBr$ in the presence of peroxide follows anti- Markownikoffs Rule.