The correct answer is Option (1) → 3-Bromocyclohexanol
In IUPAC naming of cyclic alcohols:
- The $-\text{OH}$ group gets priority over halogens.
- The carbon bearing $-\text{OH}$ is numbered 1.
- Numbering proceeds in the direction that gives substituents the lowest possible locant.
Parent chain:
- The structure is a six-membered ring $\rightarrow$ cyclohexane derivative.
- Since $-\text{OH}$ is present $\rightarrow$ parent name is cyclohexanol.
Numbering:
- Carbon with $-\text{OH}$ = C-1.
- Counting around the ring, the $\text{Br}$ substituent comes on the third carbon (not second).
Why not other options?
- Option 2 (2-Bromocyclohexanol): $\text{Br}$ is not adjacent to the $\text{OH}$ carbon.
- Option 3 (cyclohexanal): That would require an $-\text{CHO}$ (aldehyde) group, not $-\text{OH}$.
- Option 4 (3-Bromohexanol): That would be an open chain, but structure is cyclic.
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