June 2018 NY Regents Chemistry Exam
21 Which formula can represent an alkyne? (1) C2H4
(2) C2H6
(3) C3H4
(4) C3H6
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. If we take a look at C3H1, n=3. 3*2-2 = 6-2=4. It is an alkyne
Answer: 3
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