The start drug is Tolbutamide and the product is Chlorpropamide. Which of the following is incorrect? a. the -CH3 groyp is replaced with Cl atom to prevent oxidation of –CH3 group   b. The -CH3 group in Tolbutamidw can be easily oxidized into -CH20H, and then to –CO2H   c. this modification is used to prolong the duration of action of chlorpropamide   d. this modification is achieved by an oxygen enzyme   e. none of the above

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