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The only two elements in alkenes and alkynes are

August 2019 NY Regents Chemistry Exam


22 The only two elements in alkenes and alkynes are (1) carbon and nitrogen

(2) carbon and hydrogen

(3) oxygen and nitrogen

(4) oxygen and hydrogen


Solution: Table Q on the Reference Table shows Homologous Series of Hydrocarbons which includes alkenes and alkynes. The name hydrocarbon comes from hydrogens and carbon. These are the only two elements found in these molecules.

Answer: 2


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