Final answer:
The compound (CH3)3COH is a tertiary alcohol because it has the hydroxyl group attached to a carbon atom bonded to three other carbon atoms.
Step-by-step explanation:
The question is asking which of the listed compounds is a tertiary alcohol. A tertiary alcohol is one where the hydroxyl group (OH) is attached to a carbon that is itself directly bonded to three other carbon atoms. Among the given options, the compound b) (CH₃)₃COH is a tertiary alcohol because the carbon atom with the OH group is connected to three other carbon atoms (three methyl groups, CH₃).