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Exercise: reactivity and reactions of alkynes

Exercise

Fig.1

Which reaction is shown in the illustration?

Please make a choice.

Please make a choice.

correct

wrong

partly correct

This is the right answer

Addition of HCl to alkynes: mechanism with an intermediate vinyl cation

No.

Stereospecific addition of HCl to 2-butyne

Sorry, that is wrong

Addition of HCl to alkynes: mechanism with an intermediate δ complex

Sorry, that is wrong

Addition of HCl to alkynes: mechanism with an intermediate π complex

Correct!

Monospecific addition of HCl to 2-butyne

No

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Exercise

Fig.2

Which reaction is shown in the illustration?

Please make a choice.

Please make a choice.

correct

wrong

partly correct

This is the right answer

Addition of HCl to alkynes: mechanism with an intermediate vinyl cation

That is correct!

Stereospecific addition of HCl to 2-butyne

Sorry, that is wrong

Addition of HCl to alkynes: mechanism with an intermediate δ complex

No

Addition of HCl to alkynes: mechanism with an intermediate π complex

Sorry, that is wrong

Monospecific addition of HCl to 2-butyne

Sorry, that is wrong

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Exercise

Fig.3

Which reaction is shown in the illustration?

Please make a choice.

Please make a choice.

correct

wrong

partly correct

This is the right answer

Addition of HCl to alkynes: mechanism with an intermediate vinyl cation

No

Stereoselective addition of HCl to 2-butyne

Correct!

Addition of HCl to alkynes: mechanism with an intermediate δ complex

Sorry, that is wrong

Addition of HCl to alkynes: mechanism with an intermediate π complex

Sorry, that is wrong

Monospecific addition of HCl to 2-butyne

No

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Exercise

Alkynes react in the same way as alkenes in ...

Please make a choice.

Please make a choice.

correct

wrong

partly correct

This is the right answer

... electrophilic substitution reactions

Sorry, that is wrong

... nucleophilic addition reactions

No

... nucleophilic substitution reactions

Sorry, that is wrong

... electrophilic addition reactions

That is correct!

... radical addition reactions

Sorry, that is wrong

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