Identify the substances italicised : The organic compound which when solidified, forms an ice like mass.

(i) Give the IUPAC name of the following organic compounds:

(ii) What is the special feature of the structure of ethyne

(iii) Name the saturated hydrocarbon containing two carbon atoms.

(iv) Give the structural formula of acetic acid.

Arrange - Ethane, methane, ethene, ethyne - in increasing order of molecular weight [H = 1, C = 12]

Name the following organic compounds:

(i) The compound with three carbon atoms whose functional group is a carboxyl.

(ii) The first homologue whose general formula is C_nH_2n

(iii) The compound that reacts with acetic acid to form ethyl ethanoate

(iv) The compound formed by complete chlorination of ethyne.