Question

2, 3-dibromobutane can be converted to 2-butyne in a two steps reaction using

(a) (i) HCl and (ii) NaH

(b) (i) alc.KOH and (ii) NaNH₂

(c) (i) Na and (ii) NaOH

(d) (i) Br₂ and (ii) NaH

Answer 1

Answer is : (b) (i) alc.KOH and (ii) NaNH₂

For the conversion of 2,3-dibromobutane to 2-butyne following steps can be used

Step 1

In this step, dehydrohalogenation occurs where 2,3-dibromobutane gets converted into 2-bromobut-2-ene.

Step 2

In this step, also dehydrohalogenation occurs where alkenyl halide on treatment with soda amide gives 2-butyne.