Select the appropriate reagent(s) for the following four transformations.
Answer to question 1
The reagent needed to each of the transformation is given below.
(1) Sodium borohydride reduces the aldehyde to primary alcohol.
(2) Lithium aluminum hydride reduces the ester to the primary alcohol and the ketone to the secondary alcohol.
(3) Sodium borohydride reduces the acyl chloride to primary alcohol.
(4) Lithium aluminum hydride reduces the amide to the amine and the anhydride the primary alcohol.
Answer to question 2
Correct Option : Na2Cr2O7, aqueos H2SO4, acetone
The conversion of cyclohexanol to cyclohexanone is an oxidation reaction. Thus, it requires a strong oxidising reagent for the conversion to occur. NaBH4 is a reducing agent and H2O itself cannot oxidised cyclohexanol to cyclohexanone. NaIO4 is a strong oxidising agent used for the oxidation of vicinal diols to aldehydes or ketones.
NaBH4 is a strong oxidising agent and H2SO4 is a strong reducing agent and is used for the conversion of cyclohexanol to cyclohexanone.
Answer to question 3