Question

Given below are two statements:
Statement I: Propene on treatment with diborane gives an addition product with the formula $((\text{CH}_3)_2 - \text{CH}_3\text{B})$.
Statement II: Oxidation of $((\text{CH}_3)_2 - \text{CH}_3\text{B})$ with hydrogen peroxide in presence of NaOH gives propan-2-ol.
In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Statement I is correct but Statement II is incorrect
• B. Statement I is incorrect but Statement II is correct
• C. Both Statement I and Statement II are correct
• D. Both Statement I and Statement II are incorrect

Answer 1

Answer: (B)

Statement I is incorrect but Statement II is correct

Answer 2

Statement I is incorrect. Propene reacts with diborane (B 2H6) to form trialkyl borane, (CH 3)2CH-B, which is then oxidized using hydrogen peroxide in the presence of NaOH to produce propan-2-ol. The formula given in Statement I is not the correct addition product. The actual addition product is a trialkyl borane which is formed in the first step.

Statement II is correct. Oxidation of the trialkyl borane by H 2O2 in NaOH gives propan-2-ol. This is the hydroboration-oxidation reaction.