Question

please help solve question 23, question 24 and question 25. thank you

THE FOLLOWING SCHEME APPLIES TO QUESTIONS 23, 24 AND 25 12 CH HECH CH3 HyCCHE (1) H, SO H2O (2) MCPBA CH2Cl2 (3) NaBH Ethanol OH OH QUESTION 23 [2] What, if at all, is wrong with step (1)? A B The product suggests acid catalyzed anti-Markovnikov addition of water to an alkene, which is not possible The reaction needs concentrated sulfuric acid, not its dilute water solution As soon as the product of step (1) forms, sulfuric acid will dehydrate it back to the alkene so there will be no reaction overall. There is nothing wrong with the reaction as written. с D [2] QUESTION 24 What, if at all, is wrong with step (2)? A B с MCPBA does not oxidize alcohols, it forms epoxides from alkenes. MCPBA alone will not oxidize the alcohol, oxygen gas is required as the co-oxidant. The reaction must be done at high temperature, in a solvent of high boiling point. There is nothing wrong with the reaction; MCPBA is a versatile reagent that can do a variety of oxidations. D [2] QUESTION 25 What, if at all, is wrong with step (3)? A B Formation of a tertiary alcohol from a ketone requires a Grignard reagent The reaction conditions have CH,l missing, A stronger reducing agent such as LiAlHe is required. There is nothing wrong with the reaction. с D