Question

Why does not combustion occur in the innermost zone of a candle ?

Answer 1

Innermost zone of a candle covers the area surrounding the wick containing unburnt vapours produced by the melting of wax. It is called dark zone as the temperature here is very very low as a result gases do not come in contact with oxygen, hence do not burn.

Answer 2

in the innermost zone of a candle all the wax vapours are present ..... so the combustion doesn't occur in outermost zone of a candle
these wax particles will not come in contact with O2 so they don't combust
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