O level Chemistry Alkane & Alkenes (10 qns)

The compound C₆H₁₀ is a member of a hydrocarbon homologous series. What can be the first possible member os this series with the smallest relative molecular mass?

• C₂H₂

• C₂H₃

• C₂H₄

• C₂H₆

0.1 mole of a polyunsaturated hydrocarbon reacts with 9.6 dm³ of hydrogen gas. If the compound has 21 carbon atoms in its structure. What is the chemical formula of the hydrocarbon?

• C₂₁H₃₆

• C₂₁H₄₀

• C₂₁H₄₂

• C₂₁H₄₄

A neutral organic liquid is burnt in air completely, producing carbon dioxide and water. Which of the following is most likely to be that liquid?

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Linoleic acid, C₁₇H₃₁COOH, is the main fatty acid found in vegeatble oils such as soybean oil and corn oil. Which statement about linoleic acid is correct?

• It burns in air with a non-smoky flame

• It is polyunsaturated as it contains many double bonds between carbon and hydrogen atoms

• It forms a solid compound on hydrogenation

• It produces margarine when it reacts with steam in the presence of nickel catalyst

Which compoun(s) can be product(s) of addition reaction of ethene with chlorine?

• 1

• 2

• 3

Which of the following statements about alkanes and alkenes is true?

• Alkanes are unsaturated but alkenes are saturated

• Alkanes undergo substitution while alkenes undergo addition

• Alkanes and alkenes belong to the same homologous series

• Alkanes have a higher percentage composition of carbon than the corresponding alkene

How many of the following structures show an unsaturated hydrocarbon molecule?

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Hexane is heated with aluminium oxide using the apparatus shown. Which of the following hydrocarbon will not be collected?

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How many moles of hydrogen gas would react completely with one mole of the structure in the diagram to make it saturated?

• 1

• 2

• 3

• 4

Which of these molecules have the same boiling points?

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