Identify the statement that is incorrect about alkanes :

A: They are hydrocarbons.

B: There is a single covalent bond between carbon and hydrogen.

C: They can undergo both substitution as well as addition reactions.

D: On complete combustion they produce carbon dioxide and water.

Give balanced equations for the laboratory preparations of:

(i) A saturated hydrocarbon from iodomethane.

(ii) An unsaturated hydrocarbon from an alcohol.

(iii) An unsaturated hydrocarbon from calcium carbide.

(iv) An alcohol from ethyl bromide.

Give reasons for:

(i) Methane does not undergo addition reactions, but ethene does.

(ii) Ethyne is more reactive than ethane.

(iii) Hydrocarbons are excellent fuels.

The I.U.P.A.C. name of acetylene is -

A: propane
B: propyne
C: ethene
D: ethyne.