Find the odd one out and explain:

C₃H₈, C₅H₁₀, C₂H₆, CH₄

(a) Define isomerism

(b) Give the IUPAC name of the isomer C₄H₁₀ which has a branched chain.

The number of C-H bonds in ethane molecule are:

1. Four
2. Six
3. Eight
4. Ten

Give chemical equation for:

(a) The laboratory preparation of methane from sodium acetate.

(b) The reaction of one mole of ethene with one mole of chlorine gas.

(c) The preparation of ethyne from 1,2-dibromoethane.

(d) Preparation of ethane from sodium propionate.

(e) preparation of ethanol from monochloroethane and aq. sodium hydroxide.