Question

Two statements are given below
Statement (I): C-O bond length in methanol is 136 pm and in phenol 142 pm.
Statement (II): The C-O-H bond angle in methanol and phenol is almost same.

• A. Both A and R are correct and R is correct explanation of A.
• B. Both A and R are correct but R is not correct explanation of A.
• C. A is correct but R is incorrect.
• D. A is incorrect but R is correct.

Hint:

Bond length and bond angles are affected by resonance and steric factors, which play a key role in molecular geometry.

Answer 1

The Correct Option is A

The bond length of C-O in methanol (136 pm) and phenol (142 pm) differs due to the resonance effect in phenol, which weakens the C-O bond. The C-O-H bond angle is nearly the same in both, as the oxygen atoms in both molecules have similar bonding environments. Hence, both statements are correct and the reason explains the assertion.