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why does candle burn with a yellow flame??

In a candle flame, we see that near the wick, the flame is nearly invisible and a yellow luminous zone surrounds this. Near the wick, the paraffin vapors are breaking down, releasing hydrogen and creating long, unsaturated carbon chains. This process is consumes heat and can only occur because of the heat supplied by the reactions occurring in the luminous region. Here, the carbon chains are very large and acting as tiny particles of soot. These soot particles burn just like charcoal, and the yellow light released by the candle flame is from these hot, burning soot particles.

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The flame of natural gas (mostly methane) burns blue because it contains morehydrogen atoms than carbon atoms which makes the fuel burn cleaner. A candle flame does have some blue flame visible, but most of the color is orange or yellow. During combustion, the hydrogen is being turned to water vapor (in the blue flame) and carbon is being turned to carbon dioxide in the yellow flame. If a cold metal object was held in the yellow flame, the object would be covered in black soot. This is the carbon that is burning in the yellow flame.

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becoz it cannot convert into gaseous state while burning (unsaturated compound) and thus produces a sooty flame with yellow color

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Candle is mostly made up of unsaturated hydrocarbons(wax).since unsaturated H.Cs have less amount of hydrogen,as compared to saturated ones . they do not burn off completely and hence they have unburnt particles and burn with yellow sooty flame

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satureted hydrocarbons when burnt - incomplete combustion  takes place and yellow flame is produced .

saturated hydrocarbons  when burnt -complete combustion takes place and gives bliue flame.

As candle is made of unsaturated hydrocarbons they undergo incomplete combustion and yellow flame is prodused.

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