Quiz | Delocalized π Systems

1

Which of the following molecules has a conjugated π system?

1-vinylcyclohex-1-ene

cyclohexa-1,4-diene

penta-1,4-diene

3-methoxyprop-1-ene

2

What dienophile should be used to synthesize the trans-4,5-dimethylcyclohex-1-ene?

(E)-but-2-ene

(Z)-but-2-ene

2-methyl-prop-1-ene

1,3-butandiene

3

What is the best synthetic condition to perform a radical halogenation of an allylic group?

Br2 in acid condition

Br2 in basic condition

NBS, CCl4, hν

Br2, ROOR

4

What is the best condition to promote the kinetic product?

low temperature + short time

low temperature + long time

high temperature + short time

high temperature + long time

5

What is the thermodynamic product for the hydrobromination of 1,3-butandiene?

1-bromobut-2-ene

3-bromobut-1-ene

1,4-dibromobut-2-ene

3,4-dibromobut-1-ene

6

Which statement is true concerning the Diels-Alder reactions?

It is a [4+2] cycloaddition

It is accelerated when the diene is electron-rich

It is stereospecific: the endo product is favored

All of the above

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