Which of the following reactions which cannot give an alkyne? 

The equations are as follows

[Step 3]: 1,3–dibromopropane on reaction with Na metal gives cyclopropane but not alkyne .

${\text{CaC}}_{\text{2}}{\text{ + H}}_{\text{2}}\text{O}\underset{ }{\overset{ }{\to }}\text{HC}\equiv {\text{CH + Ca(OH)}}_{\text{2}}$