The correct order of boiling point for primary (1 °), secondary (2°) and tertiary (3°) alcohols is

The presence of −OH groups in a compound leads to Hydrogen-bonding, which greatly increases its boiling point. Generally, the more 'exposed' the −OH group, the better it can participate in intermolecular H-bonding and thus, the boiling point will elevate. By that logic, primary alcohols will have the highest boiling point, while tertiary alcohols will have the lowest boiling point.

$1^{\circ }\text{ alcohol }>2^{\circ }\text{ alcohol }>3^{\circ }\text{ alcohol }$