In the reaction
H−C≡CH(1) NaNH2liq.NH3−−−−−−−−−→(2) CH3CH2Br X(1) NaNH2liq.NH3−−−−−−−−−→(2) CH3CH2Br Y
X and Y are
X = 1-Butyne; Y = 3-Hexyne
H−C≡CH(1) NaNH2liq.NH3−−−−−−−−−→(2) CH3CH2BrH−C≡C−CH2(1−Butyne(X))−CH3(1) NaNH2liq.NH3−−−−−−−−−→(2) CH3CH2BrCH3CH2−C≡C(3−Hexyne(Y))−CH2−CH3