Without drawing their structures, classify each of the following compounds as an alkane, alkene, or alkyne. Assuming that only one multiple bond is present and all are noncyclical.
a. C₉H₁₆ 
b. C₄H₈ 
c. C₈H₁₆ 
d. C₆H₁₄ 

• A. a. alkane; b. alkyne; c. alkyne; d. alkene
• B. a. alkyne; b. alkyne; c. alkene; d. alkane
• C. a. alkene; b. alkyne; c. alkyne; d. alkane
• D. a. alkyne; b. alkene; c. alkene; d. alkane
• E. a. alkene; b. alkane; c. alkyne; d. alkene

Answer: (D)