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Organic Chemistry
Quick questions on Alkenes and addition reactions: N(A)-Level Chemistry
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the bromine water test?Show answer
The bromine water test distinguishes the two families:
What are addition reactions?Show answer
The double bond lets an alkene take part in an addition reaction: the double bond opens up so new atoms add on across it, turning the alkene into a saturated product. For example, ethene reacts with hydrogen to form ethane, and with bromine to form a colourless product (which is why bromine water is decolourised). An alkane has no double bond to open, so it cannot react this way.
What is q1?Show answer
State what is meant by an unsaturated hydrocarbon. [1 mark]
What is q2?Show answer
Describe what you would observe when ethene is shaken with orange bromine water, and what this shows. [2 marks]
What is q3?Show answer
Explain why ethene reacts with hydrogen in an addition reaction but ethane does not. [2 marks]
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