Physical  properties

1- Methan:

·         It is a colour less ,odourless and non-poisonous gas.

·         It is slightly soluble in water .

·         It molecule is symmetrical and non polar.

·         It is lighter than air.

·         Liquefied is less denser than water.                                                    ( Reference: STB page#131)

2-  Ethene:

·         It is colour less gas with sweet smell.

·         It produce anaesthesia on inhalation.

·         It is sparingly soluble in water but soluble in organic solvent just like alcohol and ether.

·         It Is less denser than air.                                                                     ( Reference: STB page#137)

3-Ethyne :

·         It is colour less gas wth sweet snell.

·         It is sparingly soluble in water.

·         It is less denser than air .

·         It explodes on compression to liquid because  of un stable.               ( Reference: STB page#142)

4-Benzene:

·         It is colour less liquid. Its M.P 5.5^oC   and B.P 80^oC.

·         It has peculiar smell .

·         It is highly inflammable as aromatic compound burns with a smoky flame as it contain 93.6% carbon.

·         It is immiscible in water. It is miscible in ethanol and ether colour less fat, resins ,sulphur and iodine.

·         It is TOXIC compound and cause blood cancer .

·         It is used for manufacture of nitrobenzene, dyes and drugs.              ( Reference: STB page#148)

Instruction:    Fill the Table from above information

Physical  properties	Methane	Ethene	Ethyne	Benzene
Colour
Odour
Solubility
Density (as compare than air)
Health  hazards