(a)(i) What is meant by cracking of petroleum fractions?

(ii) Write an equation for the laboratory preparation of ethene from ethanol.

(iii) Give one chemical test to distinguish between ethane and ethene.

 

(b)(i) Name the class of carbohydrates to which starch and cellulose belong.

(ii) What process is used for isolating ethanol from the other products of fermentation of sugar?

(iii) Name the organic product of the reaction between ethanol and sodium

(iv). Write the structural formula of 2-chloroethanol.

 

(c) State the reason why:

(i) benzene produces more soot than ethene on burning in excess air;

(ii) ethanoic acid has a higher boiling point than methanoic acid;

(iii) sodium chloride is used during the manufacture of soap.

(d) Give one use of: (i) ethyne (ii) coal (iii) carbon black