28) catalytic hydration of an alkene 29) The reaction of an alkene with a borane

Question

28) catalytic hydration of an alkene

29) The reaction of an alkene with a borane (BH3) followed by oxidation

30) What is the major product of the reaction shown?

28. Catalytic hydrogenation of an alkene a. typically proceeds with cis-stereochemistry. b. typically results in E-alkenes. c. typically occurs at high temperature but lower than the melting point of the metal catalyst. d. All of the above are true. e. None of the above is true. 29. The reaction of an alkene with borane (BH,) followed by oxidation a. typically results in Markovnikov hydration b. typically results in anti-Markovnikov hydration. c. typically requires metal catalysis. d. typically requires both H.SO, and HgSO, to be successful. e. None of the above is true. 30. What is the major product of the reaction shown? CH3 OH H2o OH a. b c. d. e. None of the above is the correct product.

Explanation / Answer

28) answer: a . ( H2 addition takes place only on one side of double bond. called as syn addition)

29) answer: b (the -OH group linked to more no of H-atoms containing carbon atom)

30) answer: b (markonikovs addition of hydrolysis, gives tertiary alchol)

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