6.2 Hydrocarbons

Question 1

aliphatic hydrocarbons

Answer 1

have branched or unbranched chains or rings of carbon atoms

Question 2

aromatic hydrocarbons/arenes

Answer 2

contain rings of carbon atoms in which there are delocalised electrons.

Question 3

saturated compounds

Answer 3

have only single bonds between atoms in their molecules

Question 4

octane number

Answer 4

a measure of the performance of a fuel in comparison with2,2,4 - trimethylpentane (100 score) and heptane ( 0 score)

Question 5

unsaturated

Answer 5

compounds that contain one or more double or triple bonds between atoms in their molecules

Question 6

E/Z isomerism

Answer 6

occurs when there is restricted rotation around a double bond and also different groups are attached at each end end of the bond.

Question 7

stereoisomerism

Answer 7

occurs with the same molecular and structural formulae’s but different spatial arrangement.

Question 8

carbocation

Answer 8

a reactive species which contains a carbon atom with a positive charge

Question 9

intermediates

Answer 9

atoms, molecules, ions or free radicals which dont appear in overall equation for a reaction, but are formed in one step of a reaction and used in the next

Question 10

inductive effect

Answer 10

describes the way in which electrons are either pushed towards or pulled away from a carbon atom by the atoms or groups in which it is bonded