JEE Main 2026 Apr 8 Shift 2, Chemistry Q16: Properties of Alkyl Halides (Halo Alkanes) & Aryl Halides (Halo Arenes)

JEE Main2026Apr 8, Shift 2Chemistry

Given below are two statements :

Statement-I : Due to increase in van der Waals forces, the order of boiling points is CH $_{3}$ CH $_{2}$ CH $_{2}$ I $>$ CH $_{3}$ CH $_{2}$ I $>$ CH $_{3}$ I.

Statement-II : As is more symmetric, its melting point is higher than ; however its boiling point is lower than

In the light of the above statements, choose the correct answer from the options given below :

A
Both Statement-I and Statement-II are true.
B
Both Statement-I and Statement-II are false.
C
Statement-I is true but Statement-II is false.
D
Statement-I is false but Statement-II is true.

Solution

Statement-I. Going CH $_{3}$ I $\to$ CH $_{3}$ CH $_{2}$ I $\to$ CH $_{3}$ CH $_{2}$ CH $_{2}$ I increases molecular size and polarizability, raising London dispersion forces. Boiling points rise accordingly. True.

Statement-II. The para isomer packs more efficiently in the solid lattice (higher symmetry $\to$ higher melting point). In the liquid, what matters for boiling is intermolecular attraction in disordered phase. The ortho isomer has a non-zero dipole moment (the two C–Cl dipoles don't cancel), while the para isomer's dipoles cancel by symmetry ( $μ \approx 0$ ). Stronger dipole–dipole attraction in the ortho isomer gives it the higher boiling point. True.

Concept behind this question

Properties of Alkyl Halides (Halo Alkanes) & Aryl Halides (Halo Arenes)Notes, formulas and examples →

Practice more Chemistry

Concept-wise practice with instant solutions on Fundamenthol.

Start practicing →

JEE Main 2026 Apr 8 Shift 2, Chemistry Q16: Properties of Alkyl Halides (Halo Alkanes) & Aryl Halides (Halo Arenes)

Concept behind this question

More previous year questions on Properties of Alkyl Halides (Halo Alkanes) & Aryl Halides (Halo Arenes)

Practice more Chemistry