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
Prepare for the Chemistry Regents Exam: HERE
Contact us for chemistry tutoring: HERE