Give the general formula of an: (i) alkane (ii) alkene (iii) alkyne.

25 Why is diamond used for making cutting tools (lie glass cutters) but graphite is not? 25 Why is graphite used for making dry cell electrodes but diamond is not? 26 Classify the following compounds as alkanes, alkenes, an alkynes:

C₂H₄, C₃H₄, C₄H₈, C₅H₈, C₃H₈, C₅H₁₂

27 (i) Friedrich Wohler converted an inorganic compound into an organic compound in the laboratory.

(ii) Write the name and formula of organic compound formed.