Which of the following statements is true regarding the chemicals that are used in this experiment?

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BlackTom AI · Accepted Answer

The question asks which statement is true regarding the chemicals used in this experiment. We will evaluate each option in turn.

Option a: 'Hexane is used in a reaction with iodine.' This statement asserts hexane participates directly with iodine in a reaction. In typical organic experiments involving iodine, iodine is often used as a reagent to test for unsaturation (e.g., iodine addition to alkenes) or as a colorimetric reagent, but hexane itself is a nonpolar, saturated hydrocarbon and generally serves as a solvent rather than a reactant. Since there is no common reaction where hexane actively reacts with iodine under standard conditions, this option is unlikely to be true if the context is a standard qualitative or synthesis procedure. Consider whether the experimental setup would require a reactive hexane–iodine interaction; if not, this claim would be false.

Option b: 'Cyclohexene is an unsaturated compound.' Cyclohexene contains a carbon–carbon double bond, which defines unsaturation in alicyclic hydrocarbons. The presence of a C=C bond means it is indeed unsaturated, making this statement true in the context of common organic chemistry knowledge about cycloalkenes. This aligns with standard definitions of unsaturation used to classify alkenes.

Option c: 'Potassium Permanganate is in a pure form.' Potassium permanganate (KMnO4) is frequently used as a strong oxidizing agent in qualitative analysis and oxidation reactions. In most lab settings, KMnO4 is used as a solid with water or as an aqueous solution, often with impurities or as a commercial solution containing stabilizers. The phrase 'in a pure form' is typically not accurate for reagents used in experiments because commercial KMnO4 solutions or solid pellets often contain water of crystallization or are mixed with stabilizers. Therefore, claiming it is used in a pure form is commonly incorrect.

Option d: 'Propan-2-ol is a primary alcohol.' Propan-2-ol is more commonly known as isopropanol (isopropyl alcohol) and is a secondary alcohol, not a primary one. A primary alcohol would be propan-1-ol (n-propyl alcohol). This makes the statement incorrect because it misidentifies the classification of propan-2-ol.

Overall, the options present a mix of plausible and implausible statements. The true statement, based on standard chemical knowledge about cyclohexene and the general nature of the reagents described, is that cyclohexene is an unsaturated compound, which corresponds to option b. The other options mischaracterize typical roles of hexane with iodine, the typical state of potassium permanganate in practice, and the class of propan-2-ol, respectively.

MUF0042 Chemistry Unit 2 - Semester 2, 2025 Pre-Lab Quiz: Formative Practical

Which of the following statements is true regarding the chemicals that are used in this experiment?

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