Consider the line-angle structure of the compound 1-isopropyl-4-methylcyclohexane, and answer the following questions:





(a) How many carbons are there in the molecule? 
(b) Identify the marked carbons as 1°, 2°, 3°, or 4°. 
(c) How many hydrogen atoms are at the marked carbon?

• A. (a) Ten
  (b) 2°
  (c) One
• B. (a) Ten
  (b) 3°
  (c) One
• C. (a) Eleven
  (b) 3°
  (c) Four
• D. (a) Nine
  (b) 4°
  (c) three

Answer: (B)