Question

Assertion :Although $P{F}_5,PC{l}_5$ are known, the pentahalide of nitrogen has not been observed. Reason: Phosphorus has lower electronegativity than nitrogen.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Although $P{F}_5,PC{l}_5$ and $PB{r}_5$ are known, the pentahalide of nitrogen has not been observed. This is because P has d orbitals due to which, it can expand its octet whereas N cannot expand its octet as d orbitals are absent.

Phosphorus has a lower electronegativity than nitrogen.

Hence, option $B$ is correct.