Which of the following molecules have linear shape?

The correct answer is Option (1) → \(XeF_2\)

The shapes of xenon compounds follow from VSEPR theory: count the bond pairs and lone pairs around Xe (8 valence electrons), place them as far apart as possible, and describe the shape by the atoms only.

In \( \ce{XeF2} \), Xe uses 2 electrons for the two Xe–F bonds and keeps 6 as 3 lone pairs. The 5 electron pairs take a trigonal bipyramidal arrangement with the three lone pairs in the equatorial plane, so the two F atoms are opposite each other: \( \ce{XeF2} \) is linear (sp³d).

Why the other options are incorrect

• Option (2) \(XeF_4\) — Incorrect. 4 bond pairs and 2 lone pairs (sp³d²); the lone pairs are opposite each other, so the shape is square planar.

• Option (3) \(XeF_6\) — Incorrect. 6 bond pairs and 1 lone pair (sp³d³); the shape is distorted octahedral.

• Option (4) \(XeO_3\) — Incorrect. 3 Xe=O bonds and 1 lone pair (sp³); the shape is pyramidal.

Note 1: 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):
Chemical Properties – …

Note 2: The same/similar question has been asked in different years by NTA as per the details given below: