JEE Main 20268 AprilEvening Shift
- Exam
- JEE Main
- Year
- 2026
- Date
- 8 April
- Shift
- Evening Shift
- Subject
- Chemistry
- Chapter
- Haloalkanes and Haloarenes
JEE Main 2026 · 8 April · Evening Shift · Chemistry · Haloalkanes and Haloarenes
Given below are two statements: Statement I: Due to increase in van...
Given below are two statements:
Statement I: Due to increase in van der Waals forces, the order of boiling points is CHCHCHI > CHCHI > CHI.
Statement II: As para-dichlorobenzene is more symmetric, its melting point is higher than ortho-dichlorobenzene, however its boiling point is lower than ortho-dichlorobenzene.
In the light of the above statements, choose the correct answer from the options given below:
Statement I: Due to increase in van der Waals forces, the order of boiling points is CHCHCHI > CHCHI > CHI.
Statement II: As para-dichlorobenzene is more symmetric, its melting point is higher than ortho-dichlorobenzene, however its boiling point is lower than ortho-dichlorobenzene.
In the light of the above statements, choose the correct answer from the options given below:
Options
- ABoth Statement I and Statement II are true
- BBoth Statement I and Statement II are false
- CStatement I is true but Statement II is false
- DStatement I is false but Statement II is true
Correct answer
A. Both Statement I and Statement II are true
Step-by-step solution
Statement I is true because as the size of the alkyl group increases, the molecular mass and surface area increase. This leads to an increase in the magnitude of van der Waals forces, which in turn increases the boiling point. Thus, the correct order of boiling points is .
Statement II is true because para-dichlorobenzene is more symmetrical than ortho-dichlorobenzene, allowing it to pack more efficiently in the crystal lattice, which results in a higher melting point. However, ortho-dichlorobenzene has a higher dipole moment than para-dichlorobenzene (which has a dipole moment of zero). The stronger dipole-dipole interactions in ortho-dichlorobenzene lead to a higher boiling point compared to para-dichlorobenzene.
Both Statement I and Statement II are true.
Answer: Both Statement I and Statement II are true
Statement II is true because para-dichlorobenzene is more symmetrical than ortho-dichlorobenzene, allowing it to pack more efficiently in the crystal lattice, which results in a higher melting point. However, ortho-dichlorobenzene has a higher dipole moment than para-dichlorobenzene (which has a dipole moment of zero). The stronger dipole-dipole interactions in ortho-dichlorobenzene lead to a higher boiling point compared to para-dichlorobenzene.
Both Statement I and Statement II are true.
Answer: Both Statement I and Statement II are true