Question detail

What is the result of adding bromine water to an alkene?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Alkenes

Question

A. The solution turns colorless
B. The solution remains brown
C. The solution turns yellow
D. The solution becomes cloudy

Answer

The solution turns colorless

Explanation

The correct option is The solution turns colorless. The solution turns colorless is the best answer because it directly supports the AQA A-Level Chemistry objective to describe alkenes as unsaturated hydrocarbons. This reasoning is anchored to Structure, bonding and reactivity in Alkenes, and it separates alkene from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.

Common mistake

Misunderstanding Unsaturation

Students often describe alkenes as saturated hydrocarbons instead of unsaturated hydrocarbons.

Remember that alkenes contain at least one double bond (C=C), which makes them unsaturated. The formula for alkenes is CnH2n, indicating they have fewer hydrogen atoms than saturated hydrocarbons.

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