3.3.8 Aldehydes and ketones (A-level only)

How many structural isomers with the molecular formula C₅H₁₀O react with Tollens’ reagent?

• 3

• 4

• 5

• 6

Which pair of compounds does not form a racemic mixture when the compounds react?

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Which alcohol could not be produced by the reduction of an aldehyde or a ketone?

• 2,2-dimethylpropan-1-ol

• 2-methylbutan-2-ol

• 3-methylbutan-2-ol

• pentan-3-ol

Which compound forms a racemic mixture when reacted with KCN followed by dilute acid?

• HCHO

• CH₃CHO

• CH₃COCH₃

• (CH₃CH₂)₂CO

Which alcohol could not be produced by the reduction of an aldehyde or a ketone?

• 2-methylbutan-1-ol

• 2-methylbutan-2-ol

• 3-methylbutan-1-ol

• 3-methylbutan-2-ol

Which one of the following reactions will produce an organic compound that has optical isomers?

• dehydration of butan-2-ol by heating with concentrated sulphuric acid

• reduction of pentan-3-one by warming with NaBH₄

• addition of Br₂ to 3-bromopropene

• reduction of 2,3-dimethylpent-2-ene with H₂ in the presence of a nickel catalyst

In which one of the following mixtures does a redox reaction occur?

• ethanal and Tollens’ reagent

• ethanoyl chloride and ethanol

• ethanal and hydrogen cyanide

• ethanoic acid and sodium hydroxide

Propanone can be reduced to form an alcohol. A functional group isomer of the alcohol formed is

• CH₃CH₂CH₂OH

• CH₃CH₂CHO

• CH₃OCH₂CH₃

• CH₃COCH₃

Which one of the following is not a correct general formula for the non-cyclic compounds listed?

• alcohols C_nH_2n+2O

• aldehydes C_nH_2n+1O

• esters C_nH_2nO₂

• primary amines C_nH_2n+3N

Which one of the following would not reduce an acidified aqueous solution of potassium dichromate(VI)?

• CH₃COOH

• Zn

• CH₃CHO

• Fe²⁺(aq)