Chemistry
Assertion (A): Acetylene burns with a sooty flame.
Reason (R): Acetylene contains a greater carbon content.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Organic Chemistry
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation— Acetylene (ethyne, C₂H₂) contains a higher proportion of carbon relative to hydrogen than compounds such as ethane (C₂H₆) or ethene (C₂H₄). During ordinary combustion, this excess carbon is not completely oxidised, so glowing carbon particles are produced, giving a luminous, sooty flame. Therefore both statements are correct, and the higher carbon content (Reason) directly explains why acetylene burns with a sooty flame (Assertion).
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