alkyne, benzene

Reduction by ( N2 /H2 + H2O2 ) || Reduction OF Alkynes, Benzene by Na and liquid NH3 ( Birch Reduction ) || Reduction OF Alkynes by Lindlar's Catalyst

The catalyst used to reduce an alkyne to alkene is

i. 27.8gm mixture of alkyne and alkane (both containing same number of carbon atoms) is dissolved in 1000gm of benzene. The solution freezes at 2.45^@C (lower than that of benzene). Another 27.8gm mixture requires 0.6 mol of H_2 for complete hydrogenation. Calculate the chemical formula of alkyne and alkane ( K_f for C_6H_6=4.9 ). ii. Alkyne on hydrogenation with H_2+Pt gives the same alkane. Alkyne does not react with ammoniacal AgNO_3 solution. Give the structures of both alkyne and alkane.

How are terminal alkynes distinguished and separated from internal alkynes?

Type of reactions shown by alkynes are -