burning candle

Question

A candle burns with a yellow flame.If shows that

A CO is produced,which is yellow in color
B soot is produced,which is yellow in color
C candle wax is saturated hydrocarbon
D imcomplete combustion has occurred

explain your answer

Answer 1

First of all, candle is an alkane with 28 carbons, i.e. C28H58.
For a such high ratio of carbon, the combustion is for sure to be sooty and yellow colour.
But it is worth to note that:

Incomplete combustion does not necessarily mean that carbon monoxide and/or soot must be produced. Sometimes it may produce black carbon powder.
Not only saturated hydrocarbons but also unsaturated hydrocarbons like alkenes and alkynes can also undergo incomplete combustion. The main reason for incomplete combustion is high ratio of carbon in the molecule rather than the type of compounds being burnt.
So overviewing all the answer, only D can be drawn as a conclusion.