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Bromine and propene undergo an addition reaction - CIE - A-Level Chemistry - Question 20 - 2011 - Paper 1

Question 20

Bromine and propene undergo an addition reaction. Which is a property of the product? A. It exists in cis-trans isomers. B. It is more volatile than propene. C. It p... show full transcript

Worked Solution & Example Answer:Bromine and propene undergo an addition reaction - CIE - A-Level Chemistry - Question 20 - 2011 - Paper 1

Step 1

A. It exists in cis-trans isomers.

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Answer

The product of the addition reaction between bromine and propene is a dibrominated compound. Such compounds can exhibit cis-trans isomerism if they have restricted rotation around a double bond; however, since the addition reaction converts propene's double bond into a single bond, this property does not apply.

Step 2

B. It is more volatile than propene.

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Answer

Typically, the addition product formed will have a higher molecular weight than propene due to the addition of bromine atoms. Therefore, it is unlikely to be more volatile than propene.

Step 3

C. It possesses a chiral centre.

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Answer

The addition of bromine to propene results in a product that has a chiral center due to the presence of two different substituents on the carbon atom that is bonded to both bromine atoms. Thus, this statement is correct.

Step 4

D. It possesses hydrogen bonding.

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Answer

The addition product does not possess functional groups that would typically engage in hydrogen bonding. Thus, this statement is not true.

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Bromine and propene undergo an addition reaction - CIE - A-Level Chemistry - Question 20 - 2011 - Paper 1

Worked Solution & Example Answer:Bromine and propene undergo an addition reaction - CIE - A-Level Chemistry - Question 20 - 2011 - Paper 1

A. It exists in cis-trans isomers.

B. It is more volatile than propene.

C. It possesses a chiral centre.

D. It possesses hydrogen bonding.

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