Q40 of 312 Page 241

What happens when carbon burns in air? Write the chemical equation of the reaction which takes place.

The burning of carbon in the presence of air is called combustion. In the combustion process, CO2 and H2O are formed and energy is released in the form of heat and light.

C + O2→ CO2 + Heat + Light



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39 Name the functional group which always occurs in the middle of a carbon chain. 39 Draw the structures for the following compounds:

(i) Ethanal (ii) Propanal (iii) Butanal (iv) Pentanal

 40 Why are coal and petroleum called fossil fuels? 40 Explain how coal was formed in the earth.