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Which formula represents an alkyne?

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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