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Exercise 1

Exercise

Fig.1

Which reaction type is shown in the illustration?

Please make a choice.

Please make a choice.

correct

wrong

partly correct

This is the right answer

Elimination of X2 from dihalogenoalkynes

No, sorry

Addition of X2 to alkynes

That is correct!

Addition of X2 to alkenes

Sorry, that is wrong

Elimination of X2 from dihalogenoalkenes

Sorry, that is wrong

Substitution of X2 at alkynes

No, sorry

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Exercise

Fig.2

Which reaction type does the illustration show?

Please make a choice.

Please make a choice.

correct

wrong

partly correct

This is the right answer

Selective stereohalogenation of alkynes

Sorry, that is wrong

Selective monoiodation of alkynes

No, sorry

Selective stereohalogenation of alkenes

Sorry, that is wrong

Selective dihalogenation of alkynes

No

Selective monohalogenation of alkynes

Correct!

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Exercise

In electrophilic addition reactions, for example with bromine or chlorine, alkenes are ...

Please make a choice.

Please make a choice.

correct

wrong

partly correct

This is the right answer

... more reactive than alkynes

That is correct!

... more active than alkynes

No

... less reactive than alkynes

Sorry, that s wrong

... completely inactive

Sorry, that is wrong

... immune

No, sorry

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Exercise

The carbon-carbon triple bond of an alkyne is considerably richer in electrons than the double bond of a dibromoalkene. Therefore, ...

Please make a choice.

Please make a choice.

correct

wrong

partly correct

This is the right answer

... a halogen more easily attacks a dibromoalkene

Sorry, that is wrong

... a halogen is more easily added to an alkane

No, sorry

... a halogen more easily attacks an alcohol

Sorry, that is wrong

... a halogen is more easily added to an alkyne

That is correct!

... a halogen more easily attacks an aldehyde

Sorry, that is wrong

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