Which of the following xenon compounds has a square planar structure?
A
XeF2
B
XeF6
C
XeF4
D
XeO3
Show the answer
The answer is C.
In XeF4, xenon has four bond pairs and two lone pairs (sp3d2). The lone pairs occupy opposite positions of the octahedron, leaving the four F atoms in a square plane.
A.
XeF2 has three lone pairs and two bond pairs on Xe and is linear.
B.
XeF6 has six bond pairs and one lone pair and has a distorted octahedral structure.
D.
XeO3 has three bond pairs and one lone pair on Xe and is pyramidal.
NCERT: Class 12 Chemistry (2022 edition), Chapter 7, 7.23
Sample 2NEET level
Assertion (A): Fluorine exhibits only the −1 oxidation state in its compounds. Reason (R): Fluorine is the most electronegative element and has no d orbitals in its valence shell.
A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false
D
A is false but R is true
Show the answer
The answer is A.
Fluorine, the most electronegative element, cannot show a positive oxidation state and shows only −1. The absence of d orbitals in its valence shell also means it cannot expand its octet, unlike chlorine, bromine and iodine which show +1, +3, +5 and +7.
B.
R is the reason fluorine is restricted to −1, so it does explain A.
C.
R is a true statement about fluorine.
D.
A is true: fluorine shows only −1.
NCERT: Class 12 Chemistry, Unit 7 (The p-Block Elements), Group 17 Elements: Oxidation states (2022 edition)
Practise Group 17 and Group 18 elements
Practice at the level you choose, with the answer after every question; timed tests with the answers when you submit. Every question is verified against NCERT first.