Question

Assertion (A) Oxygen has a covalency of four.
Reason (R) $d$-orbitals are absent in oxygen

• A. Both $A$ and $R$ are correct; $R$ is the correct explanation of $A$.
• B. Both $A$ and $R$ are correct; $R$ is not the correct explanation of $A$.
• C. $A$ is correct; $R$ is incorrect.
• D. $R$ is correct; $A$ is incorrect.

Answer 1

Answer: (A)

The absence of $d$-orbitals in oxygen limits its covalency to four and it rarely exceeds two.