Which among the following halogen exists in liquid state at room temperature ?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Bromine
Down group 17 the molecules become larger and the van der Waals forces between them become stronger, so the physical state changes from gas to liquid to solid:
\( \ce{F2} \) (gas) → \( \ce{Cl2} \) (gas) → \( \ce{Br2} \) (liquid) → \( \ce{I2} \) (solid)
So bromine is the halogen that is a (red-brown) liquid at room temperature.
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Physical Properties
