According to IUPAC system, the compound [figure] is named as
- Cyclohex-2-en-1-ol
- 1-Hydroxyhex-2-ene
- Cyclohex-1-en-3-ol
- Cyclohex-1-en-2-ol
Answer
(1) Cyclohex-2-en-1-ol
Solution
Principal group –OH gets C1; then the C=C gets the lowest locant (C2):
[figure]
∵ –OH (suffix -ol) outranks C=C ⇒ C1 = C–OH, double bond C2–C3 ⇒ Cyclohex-2-en-1-ol
(3) and (4) number the double bond first (wrong); (2) ignores the ring.
Answer: (1)