In which of the following, alkyne is not formed as a final product?

• A

  ${\text{BrCH}}_{\text{2}}{\text{-CH}}_{\text{2}}\text{Br + 2 Na}\underset{\Delta }{\overset{ }{\to }}$

• B

  ${\text{BrCH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{Br + NaNH}}_{\text{2}}\underset{\Delta }{\overset{ }{\to }}$

• C

  ${\text{Br}}_{\text{2}}{\text{CHCHBr}}_{\text{2}}\text{ + 2 Zn}\underset{\Delta }{\overset{ }{\to }}$

• D

  ${\text{BrCH}}_{\text{2}}{\text{CH}}_{\text{2}}\text{Br + KOH}\underset{\Delta }{\overset{alcohol}{\to }}$ , followed by reaction with sodamide