Question

Assertion :Statement-1 : $(C{H}_3{)}_{3}Si-OH$ is more acidic than $(C{H}_3{)}_{3}C-OH$. Reason: Statement-2 : $(C{H}_3{)}_{3}Si-OH$ has back bonding.

• 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.

Silicon is a more electropositive element than carbon and consequently the silyl group might be expected to be an electron donor. As such the silyl group should stabilise cations and destabilise anions.

$(C{H}_3{)}_{3}Si-OH$ is more acidic than $(C{H}_3{)}_{3}C-OH$.

$(C{H}_3{)}_{3}Si-OH$ has back bonding. Hence, the Si-O bond is stronger and O-H bond is weaker.

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