Which of the following statements is correct?

(c)  Alkynes are considerably less reactive than alkenes as for as the addition of halogen is concerned. This is due to the difficulty of alkynes to form cyclic halonium ion as the intermediates.

(d)  It lies much in favour of keto form.

Here only option 1 is correct.

The electrophilic addition of hydrogen halides to alkyne proceeds via the formation of an intermediate carbocation.