Naphthalene burns with a yellow sooty flame. This is because
- A. carbon to hydrogen ratio is low
- B. there is incomplete combustion ✓
- C. there is excess supply of air
- D. of presence of impurities of nitrogen and sulfur
Correct Answer: B. there is incomplete combustion
Explanation
Naphthalene is an unsaturated aromatic hydrocarbon with a high carbon-to-hydrogen ratio. In normal air, it undergoes incomplete combustion, producing unburnt carbon particles that give a yellow, sooty flame.
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