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Optical Activity and Epimers Quiz

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Questions and Answers

What is the purpose of using OsO4 in the hydroxylation reaction of alkenes?

To prevent further oxidation of the glycol

To avoid using expensive reagents

To give a higher yield (correct)

To make the reaction less toxic

Why are gem diols unstable in aqueous solutions?

They react with water to form stable cyclic compounds

Due to the presence of water promoting dehydration to form aldehydes or ketones (correct)

Gem diols are inherently unstable compounds

Because aqueous solutions catalyze their conversion to alkenes

In the Pinacol-Pinacolone rearrangement, what is the main purpose of the protonation step?

To promote the 1,2-rearrangement

To initiate the formation of carbocation (correct)

To catalyze the dehydration of glycols

To stabilize the gem diols

Why is OsO4 used in catalytic amounts in the hydroxylation reaction of alkenes?

Due to its high toxicity and volatility Signup and view all the answers

What is the outcome of treating epoxides with aqueous acid?

Formation of a trans 1,2-diol Signup and view all the answers

Which compound is formed when gem diols dehydrate in the absence of water?

Ketone Signup and view all the answers

What role does sodium bisulfate play in the OsO4-catalyzed formation of diols from alkenes?

Catalyzes the formation of trans 1,2-diols Signup and view all the answers

What is the primary reason for using catalytic amounts of osmium tetraoxide (OsO4) in reactions?

High toxicity and volatility Signup and view all the answers

'The alkene is treated with osmium tetraoxide, followed by sodium bisulfate' - What is the purpose of treating with sodium bisulfate in this sequence?

To neutralize excess acid Signup and view all the answers

What is the consequence of using KMnO4 for oxidation of alkenes?

Low yields due to further oxidation of functional groups Signup and view all the answers