January 2018 NY Regents Chemistry Exam
20 Which formula represents an alkyne?
(1) CnHn
(2) C2nHn
(3) CnH2n + 2
(4) CnH2n – 2
Solution: Table Q on the Reference Table shows Homologous Series of Hydrocarbons. It shows names and general formula. The formula for an alkyne is CnH2n – 2
Answer: 4
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