Question

Which among the following is NOT paramagnetic in nature?

• A. Benzene
• B. Oxygen
• C. Fe$^{3+}$
• D. Cu$^{2+}$

Hint:

Paramagnetic substances have unpaired electrons. Benzene is not paramagnetic due to its fully paired electrons in the aromatic ring.

Answer 1

The Correct Option is A

Step 1: Understanding paramagnetism.
Paramagnetism is the property of a substance that has unpaired electrons and is attracted to a magnetic field.
Step 2: Analyzing the options.
(A) Benzene: Benzene is not paramagnetic because it has no unpaired electrons in its structure; it is aromatic and follows Hückel's rule.
(B) Oxygen: Oxygen is paramagnetic due to the presence of two unpaired electrons in its molecular orbitals.
(C) Fe$^{3+$:} Fe$^{3+}$ is paramagnetic because it has unpaired electrons.
(D) Cu$^{2+$:} Cu$^{2+}$ is also paramagnetic due to unpaired electrons.
Step 3: Conclusion.
The correct answer is (A) Benzene, as it is not paramagnetic.