Lesson 17B.1
17B.1 Aldehydes and ketones: identification and reactions Quiz: Pearson Edexcel Chemistry, Unit 17
20 questions
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Lesson 17B.1, Aldehydes and ketones: identification and reactions: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 17: Organic Chemistry II, written with Revision Ninja.
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The 20 questions
-
Which functional group contains a carbonyl group attached to at least one hydrogen atom?
- Ketone
- Ester
- Carboxylic acid
- Aldehyde
-
What intermolecular force is absent in aldehydes compared to alcohols of similar mass?
- Hydrogen bonding
- Ionic bonding
- Permanent dipole
- Induced dipole
-
Which reagent gives a silver mirror with an aldehyde but not with a ketone?
- Iodine in alkali
- Lithium tetrahydridoaluminate
- Tollens' reagent
- Acidified dichromate(VI) ions
-
What colour precipitate forms when an aldehyde is warmed with Fehling's solution?
- Brick-red
- Pale yellow
- Bright blue
- Silver mirror
-
What organic product forms when propanal is reduced by lithium tetrahydridoaluminate?
- Propan-2-ol
- Propanoic acid
- Propan-1-ol
- Propene
-
What organic product is formed when propanone is reduced by lithium tetrahydridoaluminate?
- Propanal
- Propan-2-ol
- Propanoic acid
- Propan-1-ol
-
What is observed when propanone is warmed with iodine and sodium hydroxide solution?
- Yellow precipitate
- Green solution
- Silver mirror
- Orange precipitate
-
Which reagent tests for the presence of a carbonyl group in an aldehyde or ketone?
- Fehling's solution
- Acidified dichromate
- Tollens' reagent
- 2,4-DNPH
-
What functional group is formed when an aldehyde is fully oxidised by acidified potassium dichromate(VI)?
- Ester
- Carboxylic acid
- Primary alcohol
- Ketone
-
What type of bond must be broken to oxidise a ketone?
- Carbon-carbon bond
- Hydrogen bond
- Carbon-hydrogen bond
- Carbon-oxygen bond
-
What mixture of optical isomers is formed when ethanal reacts with hydrogen cyanide?
- Single enantiomer
- Meso compound
- Diastereomeric mixture
- Racemic mixture
-
Which reagent is used to reduce an aldehyde to a primary alcohol?
- LiAlH4 in ether
- NaOH and I2
- Na2Cr2O7 and H2SO4
- Concentrated H2SO4
-
How is a specific aldehyde or ketone identified after forming a 2,4-DNPH derivative?
- Measure pH level
- Measure boiling temperature
- Measure melting temperature
- Measure Rf value
-
What visual change occurs when an aldehyde is warmed with Fehling's solution?
- Silver mirror forms
- Solution turns green
- Red precipitate forms
- Yellow precipitate forms
-
Which compound gives a positive iodoform test?
- Propan-1-ol
- Ethanoic acid
- Ethanal
- Methanol
-
What is the mechanism type for the reaction of aldehydes with hydrogen cyanide?
- Electrophilic addition
- Nucleophilic substitution
- Nucleophilic addition
- Free radical substitution
-
What does the symbol [H] represent in balanced chemical equations for organic reactions?
- A hydrogen ion
- A reducing agent
- A hydronium ion
- Hydrogen gas
-
What is observed when propanone is warmed with Tollens' reagent?
- Yellow precipitate
- Red precipitate
- No reaction
- Silver mirror
-
What type of compound is formed when propanone reacts with 2,4-DNPH?
- Carboxylic acid
- Nitrile
- Hydrazone
- Hydroxynitrile
-
What is the product when propanal is oxidised by acidified dichromate(VI) ions?
- Propan-1-ol
- Propanone
- Propanoic acid
- Propanoyl chloride
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