Question

Which of the following is the structure of an alcohol with molecular formula \(\text{C}_5\text{H}_{12}\text{O}\)?

• A. A
• B. B
• C. C
• D. D

Hint:

\(\text{C}_n\text{H}_{2n+2}\text{O}\) → saturated alcohol (no ring, no double bond).

Answer 1

The Correct Option is A

Concept:
For alcohols: \[ \text{General formula} = \text{C}_n\text{H}_{2n+2}\text{O} \] Step 1: Check given formula. \[ \text{C}_5\text{H}_{12}\text{O} \] This corresponds to a saturated alcohol (no double bond or ring).
Step 2: Analyze options.

• (A) Cyclopentanol → ring → \(\text{C}_5\text{H}_{10}\text{O}\) $\times$
• (B) Open chain alcohol → saturated → \(\text{C}_5\text{H}_{12}\text{O}\) \checkmark
• (C) Branched alcohol but incorrect hydrogen count $\times$
• (D) Contains double bond → unsaturated $\times$

Step 3: Conclusion. Only open-chain saturated alcohol matches formula.