Question

what is the difference between the burning of candle and burning of coal

Answer 1

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Coal is a hydrocarbon. On burning it releases relatively large amount of heat in comparison to Woods.
Whereas,
A candle is a piece of string coated With a cylinder of wax or Paraffin which on burning releases a smaller amount of Heat in comparison to that produced by the buRNing of Coal.

Answer 2

Candle burns with a flame but coal does not burns with a flame also coal is a carbon product and its burning is harmful for environment but candle is made from wax its burning is not as much harmful as burning of coal .