How to solve this kind of question give me the concept

Only option D is showing highest boiling point for n- butanol.

Still there is explanation. If you need then I can explain you on paper

Before giving explanation I want to ask a question. What determines the boiling point ?

As the length of carbon chain increases, the surface area of the compound will also increase. Van der Waals dispersion force is proportional to the surface area. ... Branching in molecules decreases the surface area thereby decreasing the attractive force between individual molecules.So branching decreases BP

check this shib...all factors which affects BP

Still any doubt comes then please ask shib😊

wait I'm explaining

explaination

got it??

https://amp.doubtnut.com/question-answer-chemistry/arrange-the-following-in-increasing-order-of-boiling-point-n-butanen-butanoln-butylchloride-iso-buta-15199231

Just look at this 6 min video, it will be very very beneficial for your understanding.

and if any of your doubt is left, just ask me in the comment box, I'll be more than happy to help. 😊

sir can u pz tell why brachd chain has low bp

Yes, absolutely. See, when there's branching in the parent chain, the surface area of the molecule decreases because it starts becoming spherical and circular and due to this low surface area, Van Der Waals forces start decreasing and hence molecule becomes volatile i.e low boiling point.

Dear Sankar, always remember - Vanderwaals forces is directly proportional to boiling point of a compound and is inversely proportional to the surface area of the compound.