1.1. This question is about isomers. 

The structure of isomer X shown below. 

Classify the isomer as either an E or Z isomer. 

Explain your answer. 

1.2. Hex-3-ene also exhibits E/Z isomerism 

i) Recall what is meant by a stereoisomer.

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ii) Draw the structures for the E and Z stereoisomers of hex-3-ene. 

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iii) Explain why hex-3-ene can also be described as having cis-trans isomerism. 

You should correctly identify the isomers in part (ii) as cis or trans. 

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1.3. Outline the mechanism for the electrophilic addition of bromine to cis-hex-3-ene.

Give the name of the product formed. 

1.4. Explain why trans hex-3-ene react with bromine to produce the same structural isomer.