Organic Chemistry

Which is/are hydrocarbons?

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Which substance is saturated?

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Which trend(s) in physical properties is/are true for alkanes with increasing molecular mass?

• Melting and boiling points decrease.

• Density decreases.

• Viscosity increases.

• Flammability increases.

Which fuel would produce the LEAST smokiest flame when burnt?

• C₂H₄

• C₃H₆

• C₃H₈

• C₄H₁₀

The structure above shows one of the isomers of pentene.

Which one is a positional isomer of pentene?

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Which compound would be the final product formed from reacting ethene with a large excess of bromine in the presence of UV light?

• C₂H₅Br

• C₂H₄Br₂

• C₂H₃Br₃

• C₂Br₆

Which set of conditions would be most suitable to convert ethene to ethanol?

• 200°C, Ni catalyst

• 300°C, 65 atm, H₃PO₄ catalyst

• 600°C, Al₂O₃ catalyst

• room temperature, no catalyst

Which set(s) of products is/are not possible from the cracking of a long-chain alkane?

• C₄H₁₀ + 3C₂H₄

• C₄H₁₀ + H₂

• C₅H₁₀ + C₂H₄ + H₂

• C₄H₈ + C₃H₆

An organic acid has the structural formula as shown.

Which statement is incorrect?

• It turns moist blue litmus paper red.
• It decolourises aqueous bromine
• It reacts with zinc to produce hydrogen gas
• It burns in air to form carbon dioxide and water only

Which organic compound reacts with acidified potassium manganate(VII) solution, causing a colour change?

• ethane

• ethanoic acid

• ethanol

• poly(ethene)