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

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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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1
3 marks

An aromatic organic compound with molecular formula C7H8 reacts with bromine in the presence of UV light to produce a compound with molecular formula C7H7

i) Name the type of reaction taking place.

[1]

ii) Deduce the structures of the reactant and product.

[1]

iii) Give the formula of an additional organic product that could be obtained in the reaction.

[1]

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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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1a
3 marks

A complex of cobalt has the following composition by mass:

Co, 21.98%; N, 31.35%; H, 6.81%; Cl, 39.86%

i) Calculate the empirical formula of this complex.

[2]

ii) The formula of this cobalt complex can be expressed in the form [Co(L)m]x+(Cl−)n.

Suggest the chemical formula of [Co(L)m]x+.

[1]

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1b
2 marks

Nickel(II) forms a complex ion with water, [Ni(H2O)6]2+

i) Outline how the bond is formed between Ni2+ and H2O during the formation of the complex.

[1]

ii) State the geometry of the complex formed.

[1]

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