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Chirality in Organic Compounds Quiz

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Questions and Answers

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

To give a trans 1,2-diol

To catalyze the Pinacol-Pinacolone rearrangement

To convert alkenes to cis-diol (correct)

To dehydrate gem diols

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

Because it is toxic, volatile, and expensive (correct)

To prevent over-oxidation of the glycol

To increase the reaction yield

To accelerate the reaction rate

What happens to most gem diols in aqueous solutions?

They remain stable

They form 1,2-diols

They undergo hydroxylation reactions

They dehydrate to form aldehydes or ketones (correct)

What is the Pinacol-Pinacolone rearrangement?

A method for converting 1,2-diols to carbonyl compounds Signup and view all the answers

What does the Pinacol-Pinacolone rearrangement involve in terms of steps?

Protonation, carbocation formation, 1,2-rearrangement, deprotonation Signup and view all the answers

Which compound is formed from the acid-catalyzed dehydration of glycols?

Ketone Signup and view all the answers

What is the outcome of treating an epoxide with aqueous acid?

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

Why should OsO4 be used in limited quantities in reactions?

To prevent over-oxidation of glycols Signup and view all the answers

What is a major disadvantage of using KMnO4 for the oxidation of alkenes?

Potential over-oxidation Signup and view all the answers

In the Pinacol-Pinacolone rearrangement mechanism, what role does carbocation formation play?

Facilitating a 1,2-rearrangement Signup and view all the answers