Q.

During combustion of unsaturated compounds a              is seen.

A. clean flame
B. blue flame
C. red flame
D. yellow flame
Answer» D. yellow flame
Explanation: When saturated compounds are burnt in air,they give a clear(blue) flame due to complete combustion. However the burning of unsaturated compounds (alkenes and alkynes) gives a sooty (yellowish) flame due to incomplete combustion.
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