A student is given an unlabeled liquid hydrocarbon, A, known to be a single, pure, acyclic unsaturated hydrocarbon (either an alkene or an alkyne). The student performs separate small-scale reactions using excess reagents and records observations.
Observations:
- When A is shaken with bromine water in the dark at room temperature, the orange/brown colour disappears quickly.
- When A is bubbled into a flask containing hydrogen bromide gas at room temperature (no peroxides present), a single major organic product is formed.
- When A is treated with steam in the presence of a phosphoric acid catalyst, a single major alcohol is formed.
- When A is reacted with hydrogen gas over a nickel catalyst, the product is a saturated hydrocarbon.
The molar mass of A is 42.0 g mol\(^{-1}\).
A is hydrogenated with \(\mathrm{H_2}\) over a Ni catalyst until the reaction is complete. Write a balanced equation for this reaction and name the saturated hydrocarbon formed.
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Create Free Account Log inThis is a free HSC HSC Chemistry practice question worth 2 marks, testing your understanding of Investigate. It falls under Products of Reactions Involving Hydrocarbons in Module 7: Module 7: Organic Chemistry. Submit your answer above to receive instant AI-powered marking and personalised feedback.
Students focus on the principles and applications of chemical synthesis in the field of organic chemistry. Current and future applications of chemistry include techniques to synthesise new substances – including pharmaceuticals, fuels and polymers – to meet the needs of society. Each class of organic compounds displays characteristic chemical properties and undergoes specific reactions based on the functional groups present. These reactions, including acid/base and oxidation reactions, are used to identify the class of an organic compound. In this module, students investigate the many classes of organic compounds and their characteristic chemical reactions. By considering the primary, secondary and tertiary structures of organic materials, students are provided with opportunities to gain an understanding of the properties of materials – including strength, density and biodegradability – and relate these to proteins, carbohydrates and synthetic polymers.
Inquiry question: What are the products of reactions of hydrocarbons and how do they react?
investigate, write equations and construct models to represent the reactions of unsaturated hydrocarbons when added to a range of chemicals, including but not limited to: - hydrogen (H2) - halogens (X2) - hydrogen halides (HX) - water (H2O) (ACSCH136)
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