14.2 reactions of alcohols

Question 1

what colour are dichromate(VI) ions?

Answer 1

orange

Question 2

what colour are Cr3+ ions?

Answer 2

green

Question 3

what conditions and reagents are needed for the oxidation of alcohols?

Answer 3

• K2Cr2O7
• H2SO4
• reflux/ distillation

Question 4

what do primary alcohols oxidise to under distillation?

Answer 4

aldehydes

Question 5

what do primary alcohols oxidise to under reflux?

Answer 5

carboxylic acids

Question 6

what do secondary alcohols oxidise to under reflux?

Answer 6

ketones

Question 7

what is the colour change when alcohols are oxidised?

Answer 7

orange -> green

Question 8

what do tertiary alcohols oxidise to under reflux?

Answer 8

cannot oxidise

Question 9

what is a dehydration reaction?

Answer 9

reaction in which a water molecule is removed from the starting material

Question 10

what do alcohols dehydrate to?

Answer 10

alkenes

Question 11

what conditions and reagents are needed to dehydrate alcohols?

Answer 11

• H3PO4 catalyst

- heated under reflux

Question 12

what are the conditions and reagents needed to convert alcohols to haloalkanes?

Answer 12

• sodium halide
• H2SO4
• heat under reflux

Question 13

how is HBr (a hydrogen halide) produced by converting alcohols to haloalkane?

Answer 13

NaBr(s) + HSO4(aq) -> NaHSO4(aq) + HBr(aq)

Question 14

what is the overall equation for the reaction of propan-2-ol with H2SO4 and NaBr?

Answer 14

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