What is the correct IUPAC name for the compound ?

1. a. 1-hydroxy-2-methylcyclohexane
2. b. 1-methylcyclohexanol
3. c. 2-methylcyclohexanol
4. d. no correct response

Interpretation:

The correct IUPAC name for the given compound has to be chosen from the given options.

Concept Introduction:

IUPAC rules for naming alcohols that contain single hydroxyl group:

• Longest carbon chain has to be identified that contains hydroxyl group also. The chain name is obtained by replacing the letter “-e” in alkane with “-ol”.
• The numbering has to be given so that the hydroxyl group gets the least numbering.
• Name and location of any other substituent present in the chain has to be identified.
• If in a ring the hydroxyl group is present, then that carbon is numbered 1 and the numbering then proceeds counterclockwise or clockwise in a way that substituents present if any gets the least numbering.
• Hydroxyl group as a substituent in a molecule is named as hydroxy group rather than hydroxyl group.

IUPAC rules for naming alcohols that contain more than one hydroxyl group:

• The same rules said above is followed but the prefix di-, tri-, tetra etc is added corresponding to the number of hydroxyl groups that is present.

Reason for correct option:

Given structure is,

The longest continuous carbon chain with the hydroxyl group is found to be six carbon chain with a cyclic structure. Therefore, the parent alkane is cyclohexane. As a hydroxyl group is present the name of the alcohol can be given as cyclohexanol.

The numbering has to be given so that the hydroxyl group gets the least numbering. In this case, the hydroxyl group is given the number 1. A methyl substituent is found to be present on the given structure. Numbering for the substituent has to be given in a way that methyl gets the least number...