Answer
a) Alkyne
b) Alkane
c) Alkyne
d) Akene
Work Step by Step
a) The general formula for an alkyne is $C_{n}H_{2n-2}$. Comparing this with $C_{4}H_{6}$, we will find that when n$=$4, so it satisfies the general formula of an alkyne.
b) The general formula for an alkane is $C_{n}H_{2n+2}$. Comparing this with $C_{6}H_{14}$, we will find that when n$=$6, so it satisfies the general formula of an alkane.
c) The general formula for an alkyne is $C_{n}H_{2n-2}$. Comparing this with $C_{8}H_{14}$, we will find that when n$=$8, so it satisfies the general formula of an alkyne.
d) The general formula for an alkene is $C_{n}H_{2n}$. Comparing this with $C_{11}H_{22}$, we will find that when n$=$11, so it satisfies the general formula of an alkene.