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Exercise: Hydration of alkynes - hydroboration

Exercise

What is shown in the interactive illustration?

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Fig.1

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Please make a choice.

correct

wrong

partly correct

This is the right answer

A sterically hindered dialkylborane

Correct! It is diisopentyl borane

A sterically hindered dialkylburane

No, sorry

A sterically hindered trialkylborane

Sorry, that is wrong

The sterically hindered diphenyl borane

Sorry, that is wrong

A straight-chain dialkylborane

No, sorry

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Exercise

What is shown in this interactive illustration?

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Fig.2

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correct

wrong

partly correct

This is the right answer

A sterically hindered diallylborane

Sorry, that is wrong

A sterically hindered dialkylburane

No, sorry

A sterically hindered trialkylborane

Sorry, that is wrong

The sterically hindered dicyclohexyl borane

That is correct! It is dicyclohexyl borane

A straight-chain dialkylborane

No, sorry

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Exercise

The mechanism of hydroboration of alkynes is similar to that of hydroboration ...

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correct

wrong

partly correct

This is the right answer

... of alkanes

No, sorry

... of alkenes

That is correct!

... of alcohols

Sorry, that is wrong

... of aldehydes

Sorry, that is wrong

... of ketones

No, sorry

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Exercise

The addition of BH3 (from B2H6) to an alkyne is a stereospecific cis addition and ...

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correct

wrong

partly correct

This is the right answer

... the boron atom is regiospecifically added to the higher-substituted carbon atom

Sorry, that is wrong

... the hydrogen atom is regiospecifically added to the lower-substituted carbon atom.

No, sorry

... the boron atom is non-regioselectively added to one carbon atom or the other.

Sorry, that is wrong.

... the boron atom is not added to any carbon atom

No, sorry

... the boron atom is regiospecifically added to the lower-substituted carbon atom

That is correct!

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Exercise

The hydration of alkynes by oxymercuration yields ...

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correct

wrong

partly correct

This is the right answer

... the anti-Markovnikov enol

Sorry, that is wrong

... the Markovnikov enol

Correct!

... the anti-Markovnikov ketone

No, sorry

... the Kasparov enol

Sorry, that is wrong

... the Karpov enol

Sorry, that is wrong

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Exercise

The tautomerization of an enol formed by hydroboration, oxidation and hydrolysis of a terminal alkyne yields ...

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correct

wrong

partly correct

This is the right answer

... a ketone

Sorry, that is wrong

... an ester

Sorry, that is wrong

... a carboxylic acid

No, sorry

... an aldehyde

That is correct!

... an alcohol

Sorry, that s wrong

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