Cyclohexene, C6H10, is a cycloalkene. Cycloalkenes react in a similar way to alkenes. [Figure: Structure of cyclohexene with 6 carbons in a ring, one double bond, and 10 hydrogens] cyclohexene

1. (a)(i)Cyclohexene is an unsaturated hydrocarbon. What is meant by the term unsaturated?[1]
2. (a)(ii)What is meant by the term hydrocarbon?[1]
3. (b)Construct the equation for the complete combustion of cyclohexene.[1]
4. (c)(i)Cyclohexene reacts with bromine. This is an addition reaction. Write the molecular formula of the product of this reaction.[1]
5. (c)(ii)What would be observed in this reaction?[1]
6. (d)Cyclohexene can be manufactured from hexane as shown in the equation. C6H14 → C6H10 + 2H2 Calculate the mass of cyclohexene that can be made from 258 g of hexane. [Mᵣ of cyclohexene = 82] mass of cyclohexene = .......................................................................... g[2]
7. (e)(i)Another cycloalkene has the following percentage composition by mass. C, 88.2%; H, 11.8% Use the percentage composition by mass to show that the empirical formula of this cycloalkene is C5H8.[2]
8. (e)(ii)The cycloalkene has a relative molecular mass, Mᵣ, of 68. Draw the structure of the cycloalkene, showing all of the atoms and all of the bonds.[1]

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