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 C*n*H2*n*+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