One mole of 1,2-dibromopropane on treatment with X moles of `NaNH_(2)` followed by treatment with ethyl bromide gave a pentyne. The value of X is:

Options

A. One
B. Two
C. Three
D. Four

Answer

C

Explanation

`underset("1,2-Dibromopropane")(overset(Br)overset(|)(CH_(2)))-overset(Br)overset(|)(CH)-CH_(3)= underset(-2NaBr, -2NH_(3))overset(+2NaNH_(2))to`
`CH_(2)-=C-CH_(3) underset(-NH_(3))overset(+NaNH_(2))to Na^(+)C^(-)-=C-CH_(3) overset(+C_(2)H_(2)Br)to underset("2-Pentyne")(C_(2)H_(5)-C-=C-CH_(3))`
One mole of 1,2- dibromopropane requires three moles of `NaNH_(2)` in the squence of reactions