IUPAC Name is 1-hexene-5-yne.

Geometrical isomers have same molecular formula but differ in the position of atoms or groups in space due to hindered rotation about a double bond.

In steam distillation of toluene, the pressure of toluene in vapour is less than pressure of barometer, because it is carried out when a solid or liquid is insoluble in water and is volatile with steam but the impurities are non-volatile.