NY Regents Chemistry Exam June 2022
25 Which formula represents a saturated hydrocarbon?
(1) C2H2
(2) C2H4 (3) C6H10
(4) C6H14
Explanation: Saturated hydrocarbons have single bonds only and belong to the alkane family. According to Table Q on the Reference Table, alkanes have a formula of CnH2n+2. Let's now see which of the answer choices correspond to this formula. For 2 carbons, we must have 2(2)+2 = 6 hydrogens. We can eliminate choices 1 and 2. For 6 carbons, we must have 2(6)+2= 14 hydrogens.
Answer: 4