Name the scientist who disproved the ‘vital force theory’ for the formation of organic compounds.

2 What are the two properties of carbon which lead to the formation of a large number of carbon compounds? 3 State whether the following statement is true or False:

Diamond and graphite are the covalent compounds of carbon element (C).

5 Name the element whose allotropic form is graphite. 6 In addition to some propane and ethane, LPG cylinders contain mainly two isomers of another alkane. Name the two isomers and write their condensed structural formulae.