Question : What is the colour of the flame when unsaturated hydrocarbons burn?
Option 1: Blue
Option 2: Red
Option 3: Green
Option 4: Yellow
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Correct Answer: Yellow
Solution : The correct option is Yellow.
Alkenes and alkynes are types of unsaturated hydrocarbons. They are not aromatic. During incomplete combustion of these hydrocarbons, many carbons do not burn, resulting in a yellow flame. Alkanes, on the other hand, are a type of saturated hydrocarbon. They produce a blue-coloured flame during the complete combustion of carbon.
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