Answer:
\[\underset{\begin{smallmatrix} \\ \text{Pentan-1-ol}\,\text{(A)} \end{smallmatrix}}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}OH}}\,\] \[\underset{\text{2-Methylbutan-2-ol}\,\text{(B)}}{\mathop{C{{H}_{3}}\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,C{{H}_{2}}C{{H}_{3}}}}\,\]\[\underset{\begin{smallmatrix} \\ \text{3-Methylbutan-2-ol}\,\text{(C)} \end{smallmatrix}}{\mathop{C{{H}_{3}}\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\mathop{C}}\,H\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}\,HC{{H}_{3}}}}\,\]
Correct order: A > C > B
The boiling points are linked to Van der Waals forces of attraction which depend upon the surface area. Smaller the molecular size, lesser is the surface area or Van der Waals forces and also the boiling point.
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