Question

Assertion :$P{H}_3$ exists but $P{H}_5$ does not exist while both $PC{l}_3$ and $PC{l}_5$ exist. Reason: $P{H}_3$ has $s{p}^3$ -hybridization.

• A. The Assertion is true, Reason is true and Reason is the correct explanation for Assertion
• B. The Assertion is true, Reason is true and Reason is NOT the correct explanation for Assertion
• C. The Assertion is true, Reason is false.
• D. The Assertion is false, Reason is true.

Answer 1

The correct option is C The Assertion is true, Reason is false.

$P{H}_3$ exists but $P{H}_5$ does not exist due to the absence of d-orbital contraction while both $PC{l}_3$ and $PC{l}_5$ exist.
In $P{H}_3$ hybridization is absent according to Drago's rule.
Thus the Assertion is true and Reason is false.