Question

Assertion :Statement-1 : The order of $\pi$ bond formation tendency is $Si-O<P-O<S-O<Cl-O$. Reason: On moving from left to right along a period, the effective nuclear charge generally increases and consequently the energy of the 3d-orbital decreases from $Si,\to P\to S\to Cl$.

• A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1
• B. Statement-1 is true, statement-2 is true and statement-2 is not the correct explanation for statement-1
• C. Statement-1 is true, statement-2 is false.
• D. Statement-1 is false, statement-2 is true.

Answer 1

The correct option is A Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1

On moving from left to right along a period, the effective nuclear charge increases which decreases the energy of the 3d-orbital from $Si,\to P\to S\to Cl$.

Hence, the order of $\pi$ bond formation tendency is $Si-O<P{}_O<S-O<Cl-O$.

Thus, Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.