Which of the following statements is/are correct? i. Melting point of alkane increases with increase in number of C atoms and with increase in branching ii. Boiling point of alkane increases with increase in number of C atoms but with decrease in branching iii. Cycloalkanes have lower boiling point than normal alkane with same number of C atoms iv. Alkenes have lower boiling point than same number of C atoms in alkanes

Question

Which of the following statements is/are correct? i. Melting point of alkane increases with increase in number of C atoms and with increase in branching ii. Boiling point of alkane increases with increase in number of C atoms but with decrease in branching iii. Cycloalkanes have lower boiling point than normal alkane with same number of C atoms iv. Alkenes have lower boiling point than same number of C atoms in alkanes (A) (I), (II) (B) (I), (II), (III) (C) (III), (IV) (D) (IV)

Tardigrade Admin · Accepted Answer

Higher the intermolecular forces higher is the boiling point. because as the surface area increases the vandrwall force of attraction increases.

melting point depends on packing fraction, more braching ,surface area of molecules decreases and they become more compact and thus easier to pack hence melting point increases.