Question

Assertion :Bond angle in $N{H}_3$ is greater than that in $P{H}_3$. Reason: $P-H$ bonds are longer the lower electronegativity of $P$ permits electron density to be displaced towards $H$ to a greater extent than in the case of $N{H}_3$.

• 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. Assertion is incorrect but Reason is correct

Answer 1

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

Correct reason: Due to larger atomic size of $P$ the electron density on it in ${PH}_3$ is relatively small which provides lesser repulsion resulting in lower value of bond angle.