MCQ practice · SSC Chemistry Board questions · Chapter 11: Mineral Resources: Fossils
Which is the general formula of alkynes?
Think it through first, then pick an option.
- a CₙH₂ₙ
- b CₙH₂ₙ₊₂
- c CₙH₂ₙ₋₂
- d CₙH₂ₙ₊₁
Answer and explanation
Correct answer: c CₙH₂ₙ₋₂
The general formula of alkynes is CₙH₂ₙ₋₂, e.g. ethyne C₂H₂.
Why the other options are wrong
- a CₙH₂ₙ: CₙH₂ₙ is the alkene formula; alkynes are CₙH₂ₙ₋₂.
- b CₙH₂ₙ₊₂: CₙH₂ₙ₊₂ is the alkane formula; alkynes are CₙH₂ₙ₋₂.
- d CₙH₂ₙ₊₁: CₙH₂ₙ₊₁ is the alkyl group, not a compound; alkynes are CₙH₂ₙ₋₂.
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