Question

Identify the reagents X, Y and Z used to bring out the following reactions.

• A. X = Alkaline KMnO4, Y = dil HCl, Z = CrO3
• B. X = Air, Y = dil H2SO4, Z = Cr2O7^{2-}/H+
• C. X = H2O2, Y = Con(C) HCl, Z = O3
• D. X = DIBAL-H, Y = Con(C) HNO3, Z = CrO2Cl2

Hint:

When performing oxidation reactions, always remember that air can be used for initial oxidation, while strong oxidizing agents like dichromate ions are used to further oxidize the compoun(D)

Answer 1

The Correct Option is B

This is a reaction where the compound 2-Phenylpropane undergoes oxidation to form C6H5OH (Phenol). The sequence involves first the oxidation of the side chain (benzyl group) to form a carboxylic acid, and then a further step to reduce the carboxyl group to an alcohol. - Step 1: The reaction starts with Air (X), which provides the oxygen required for the oxidation of the side chain. The side chain in 2-Phenylpropane gets oxidized to a carboxyl group. - Step 2: The oxidation process is facilitated by dilute H2SO4 (Y), which helps in the conversion of the alcohol group to the carboxyl group by catalytic oxidation. - Step 3: The reaction is then completed using Cr2O7^{2-}/H+ (Z), which is a strong oxidizing agent used to convert the carboxyl group into an alcohol group (Phenol), thus giving the final product C6H5OH. Thus, the correct sequence of reagents is: X = Air, Y = dil H2SO4, and Z = Cr2O7^{2-}/H+.