Question 21
HydrocarbonsWhich of these hydrocarbons burns in air with a sooty flame?
- A.C2H6
- B.C6H6
- C.C4H10
- D.C3H8
Show the answer and explanation
Answer: B (C6H6)
Explanation
Benzene, C6H6, has a high carbon-to-hydrogen ratio, so it burns incompletely and gives a smoky, sooty flame; the alkanes burn cleanly.