Lesson 3.3.6.1
3.3.6.1 Identification of functional groups by test-tube reactions Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 3.3.6.1, Identification of functional groups by test-tube reactions: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.
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The 20 questions
-
Which reagent forms a silver mirror when warmed with an aldehyde?
- Bromine water
- Fehling's solution
- Tollens' reagent
- Acidified potassium dichromate(VI)
-
Which reagent gives a brick-red precipitate with an aldehyde on warming?
- Fehling's solution
- Sodium carbonate solution
- Bromine water
- Tollens' reagent
-
Which functional group decolourises bromine water at room temperature?
- Alkane
- Alkene
- Aldehyde
- Alkanol
-
Which gas is released when a carboxylic acid reacts with sodium carbonate solution?
- Hydrogen
- Carbon dioxide
- Oxygen
- Carbon monoxide
-
Which compound does NOT give a brick-red precipitate with Fehling's solution on warming?
- Ethanal
- Butanal
- Propanal
- Propanone
-
A compound gives orange-to-green with acidified dichromate(VI) and a silver mirror with Tollens' reagent. Which group is most likely present?
- Alkene
- Tertiary alcohol
- Ketone
- Aldehyde
-
Which colour change is seen when a primary alcohol is warmed with acidified potassium dichromate(VI)?
- Orange to green
- Green to orange
- Purple to colourless
- Blue to brick-red
-
Which compound gives no colour change when warmed with acidified potassium dichromate(VI)?
- Propanal
- Propan-1-ol
- Propan-2-ol
- 2-methylpropan-2-ol
-
What colour change is observed when an alkene reacts with acidified potassium manganate(VII)?
- Orange to green
- Blue to red
- Colourless to brown
- Purple to colourless
-
Which reagent distinguishes ethanoic acid from ethanol by producing effervescence?
- Tollens' reagent
- Acidified dichromate
- Bromine water
- Sodium carbonate
-
Propanone is reduced by NaBH4 in aqueous solution. What is the organic product?
- Propan-1-ol
- Propanal
- Propan-2-ol
- Propanoic acid
-
Which product forms when butanal is reduced by [H]?
- Butan-2-ol
- Butanoic acid
- Butan-1-ol
- Butanone
-
In the reduction of a carbonyl compound by NaBH4, which species acts as the nucleophile?
- Bromide ion, Br-
- Hydride ion, H-
- Cyanide ion, CN-
- Hydroxide ion, OH-
-
Which functional group produces a silver mirror when warmed with Tollens' reagent?
- Aldehyde
- Alcohol
- Carboxylic acid
- Ketone
-
Which functional group causes effervescence when added to sodium carbonate solution?
- Carboxylic acid
- Aldehyde
- Alkene
- Alcohol
-
Which reagent distinguishes an aldehyde from a primary alcohol, since both give orange-to-green with acidified dichromate(VI)?
- Sodium carbonate solution
- Sodium borohydride solution
- Bromine water
- Tollens' reagent
-
A compound gives orange-to-green with acidified dichromate(VI) but no silver mirror with Tollens' reagent. Which is most likely?
- 2-methylpropan-2-ol
- Propan-2-ol
- Propanone
- Propanal
-
A compound decolourises bromine water and gives a silver mirror with Tollens' reagent. Which structure fits?
- CH3CH=CHCH3 (but-2-ene)
- CH3CH2COCH3 (butanone)
- CH2=CHCH2COOH (but-3-enoic acid)
- CH2=CHCH2CHO (but-3-enal)
-
What main organic product forms when propan-1-ol is heated under reflux with excess acidified dichromate(VI)?
- Propanal
- Propanone
- Propyl propanoate
- Propanoic acid
-
Which type of carbonyl compound is oxidised by Tollens' reagent?
- Ketone
- Carboxylic acid
- Aldehyde
- Ester
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