Question

Assertion: $3d_{z^2}$ orbital is spherically symmetrical.
Reason: The shapes of all five $d$-orbitals are similar to each other.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

Answer: (D)

s-orbital is spherically symmetric, $p$-orbitals have dumbell shape and d-orbitals have double-dumbells. Among all five $d$-orbitals, $d_{z^2}$ has a different shape where it has one dumbell along $z$-axis and electron ring perpendicular to it. In the absenceof any field the orbitals have same energy i.e. they are degenerate orbitals but have different shape/orientation.
Both Assertion and Reason are incorrect