Q5 of 312 Page 220

Name the element whose allotropic form is graphite.

Diamond and graphite are allotropic form of carbon.

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3 State whether the following statement is true or False:

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

 4 Name the scientist who disproved the ‘vital force theory’ for the formation of organic compounds. 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. 7 Buckminsterfullerence is a spherical molecule in which 60 carbon atoms are arranged in interlocking hexagonal and pentagonal rings of carbon atoms.

(a) How many hexagons of carbon atoms are present in one molecule of buckministerfullerene?


(b) How many pentagons of carbon atoms are present in one molecule of buckministerfullerence ?