State any three points of differences between ionic and covalent compounds.

Name the products obtained on complete combustion of hydrocarbons? How is the gas evolved during combustion tested in the laboratory? Explain in brief.

Write the next higher homologue of:

(a) C₃H₆ (b) C₅H₈

What happens when

(Write a chemical equation in each case)

(a) ethanol is burnt in the air?

(b) ethanol is heated with excess conc. H₂SO₄ at 443 K?

(c) a piece of sodium is dropped into ethanol?

What are hydrocarbons? Write the general formula of (i) saturated hydrocarbons, and (ii) unsaturated hydrocarbons and draw the structure of one hydrocarbon of each type.