Welcome to the Quiz!
This quiz contains 21 questions from a mix of 1 subtopics.
What functional group is present in both aldehydes and ketones?
hydroxyl group
alkyl group
carboxyl group
carbonyl group
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Where is the carbonyl group located in an aldehyde?
between two carbon chains
at the end of the carbon chain
at the beginning of the carbon chain
within the carbon chain
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Which of the following can be used as an oxidising agent to convert primary alcohols to aldehydes and carboxylic acids?
sodium hydroxide
sodium borohydride
hydrogen peroxide
potassium dichromate(VI)
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What happens to the dichromate(VI) ion during the oxidation of primary alcohols?
it is reduced to the chromium(II) ion
it is reduced to the chromium(III) ion
it is oxidised to the chromium(II) ion
it is oxidised to the chromium(III) ion
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Which of the following best describes the colour change observed when dichromate(VI) ion is reduced to chromium(III) ion?
orange to green
green to orange
orange to blue
blue to green
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How can you control the oxidation of a primary alcohol to stop at the aldehyde product?
heating with concentrated sulfuric acid
heating with sodium hydroxide
refluxing with acidified K2Cr2O7
gently heating with acidified K2Cr2O7 in a distillation set-up
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What type of alcohol can be oxidised to form a ketone?
primary alcohol
secondary alcohol
tertiary alcohol
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Which of the following statements is true about the oxidation of ketones by acidified K2Cr2O7?
ketones can be oxidised further to aldehydes
ketones can be oxidised further to carboxylic acids
ketones can be oxidised further to esters
ketones cannot be oxidised further by acidified K2Cr2O7
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Which of the following is an example of an aldehyde?
propanoic acid
propanone
butanone
ethanal
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Which of the following is an example of a ketone?
ethanoic acid
methanol
propanone
propanal
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What type of reaction occurs when a primary alcohol is converted to an aldehyde or carboxylic acid?
oxidation
reduction
hydrolysis
esterification
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Why do aldehydes undergo oxidation more readily than ketones?
ketones have a strongly acidic hydrogen attached to the carbonyl carbon
aldehydes have a weakly acidic hydrogen attached to the carbonyl carbon
aldehydes have a strongly acidic hydrogen attached to the carbonyl carbon
ketones have a weakly acidic hydrogen attached to the carbonyl carbon
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Which of the following products is formed when an aldehyde is reduced using a reducing agent like sodium borohydride (NaBH4)?
tertiary alcohol
secondary alcohol
carboxylic acid
primary alcohol
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Which of the following products is formed when a ketone is reduced using a reducing agent like sodium borohydride (NaBH4)?
primary alcohol
tertiary alcohol
secondary alcohol
carboxylic acid
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In the reduction of carbonyl compounds to alcohols, what role does the reducing agent play?
it provides hydroxide ions (OH-) which act as nucleophiles
it provides hydride ions (H-) which act as nucleophiles
it provides protons (H+) which act as electrophiles
it provides electrons which act as nucleophiles
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What type of reaction occurs when aldehydes and ketones react with hydrogen cyanide (HCN)?
electrophilic substitution
nucleophilic addition
nucleophilic substitution
electrophilic addition
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What are the products formed when aldehydes and ketones react with hydrogen cyanide (HCN)?
hydroxynitriles
alcohols
carboxylic acids
esters
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Hydroxynitriles contain which of the following substituents?
cyano (-CN) and hydroxy (-OH)
cyano (-CN) and carboxyl (-COOH)
hydroxy (-OH) and carboxyl (-COOH)
hydroxy (-OH) and alkyl (-R)
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Why is hydrogen cyanide often generated in situ when reacting with aldehydes and ketones?
hydrogen cyanide is expensive
hydrogen cyanide is unstable
hydrogen cyanide is toxic
hydrogen cyanide is insoluble in water
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Which of the following reactions represents the oxidation of methanal to methanoic acid?
CHO + [O] ➔ COOH
HCHO + [O] ➔ HCOOH
HCHO + 2[O] ➔ CH3OH
CHO + 2[O] ➔ CH2OH
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Which of the following reactions represents the reduction of a ketone to a secondary alcohol?
CH3CHO + 2[H] ➔ CH3CH2OH
CH3COCH3 + 2[H] ➔ CH3CH(OH)CH3
CH3COCH3 + [H] ➔ CH3CH2CHO
HCHO + 2[H] ➔ CH3OH
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