IBChemistryDPSLExam QuestionsWhat are the Mechanisms of Chemical Change?Electron Pair Sharing Reactions

Electron Pair Sharing Reactions (DP IB Chemistry: SL): Exam Questions

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Electron Pair Sharing Reactions

Easy
Medium
1a
1 mark

A reaction scheme for propene is shown below.

10-2-ib-sl-sq-easy-q1a-reaction-scheme-of-propene

State the condensed structural formula of propene.

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1b
3 marks

State the IUPAC names for compounds A, B and Cshown in the reaction scheme in part (a).

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1c
3 marks

Propene will also react to form an alcohol. State the reagents and conditions required for the formation of an alcohol from propene. 

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1d
1 mark

State the colour change when compound B is formed from propene. 

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1e
2 marks

Propene can form polypropene. Draw the repeating unit that will be formed via the addition polymerisation of propene. 

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2a
2 marks

The structure of but-1-ene is shown below.

But-1-ene IB SL SQ 10.2 E Q5a

Draw and state the name of the secondary halogenoalkane formed when but-1-ene reacts with HCl. 

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2b
2 marks

Explain why halogenoalkanes are more reactive than alkanes.

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2c
3 marks

State the reagents and conditions required for the formation of propan-1-ol from 1-bromopropane. 

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2d
1 mark

The type of reaction outlined in part (c) is nucleophilic substitution. State the meaning of the term nucleophile. 

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3a
2 marks

Define the term nucleophile. 

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3b
2 marks

Explain why the hydroxide ion, OH- , is a stronger nucleophile than water. 

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1a
1 mark

Hydrogen bromide, HBr, contains a polar covalent bond. When hydrogen bromide reacts with an alkene, the H–Br bond breaks by heterolytic fission.

Define the term heterolytic fission.

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1b
1 mark

Write an equation for the heterolytic fission of the H–Br bond in hydrogen bromide.

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1c
1 mark

Identify the electrophile formed by this fission and explain why it behaves as an electrophile.

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2a
1 mark

The starting materials for many products are alkenes such as propene.

State the type of reaction that occurs when propene is converted into chloropropane.

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2b
1 mark

Two possible isomeric products can be formed in the conversion of propene to chloropropane. 

State the type of isomerism that is exhibited by these chloropropane products.

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3a
1 mark

Butan-1-ol can be formed by the catalytic reduction of butanal. State the reagents for this reduction to occur

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3b
1 mark

State the reagent required to reduce butanoic acid to butan-1-ol. 

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3c
1 mark

Using your answer to (b), write the equation for the reduction reaction of butanoic acid.

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