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In 18, the 2 refers to the carbon that the alcohol is attached to, which is the second carbon in the three-carbon chain. In 19, the alcohol is named in the same way with the 2-hexanol, which tells you that the alcohol is attached to the second carbon in the six-carbon chain. The fact that that's a secondary alcohol refers to the fact that the carbon attached to the hydroxyl group is attached to two other carbons. So you can have a primary alcohol if the carbon is only attached to one other carbon and a tertiary alcohol if the carbon is attached to three other carbons. The alcohol gets priority over the two methyl groups because functional groups always get the highest priority.
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