What is the IUPAC, name of dimethyl ether?

Draw the structural formula of a compound with two carbon atoms in the following case. 

An alkane with a carbon to carbon single bond.

Draw the structural formula of a compound with two carbon atoms in the following case. 

An alcohol containing two carbon atoms.

Draw the structural formula of a compound with two carbon atoms in the following case. 

An unsaturated hydrocarbon with a carbon to carbon triple bond.

Ethane, Ethene, Ethanoic acid, Ethyne, Ethanol

From the above, name:

(a) The compound with $-\mathrm{OH}$ as the part of its structure.

(b) The compound with $-\mathrm{COOH}$ as the part of its structure.

(c) Homologue of homologous series with general formula ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}}$ .

Give the correct IUPAC name and the functional group for each of the compounds whose structural formulae are given below :

Give the correct IUPAC name and the functional group for each of the compounds whose structural formulae are given below :