A LevelChemistryCIETopic Questions13. An Introduction to AS Level Organic Chemistry13.1 Formulas, Functional Groups & the Naming of Organic Compounds

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First teaching 2023

First exams 2025

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Formulas, Functional Groups & the Naming of Organic Compounds (CIE A Level Chemistry)

Topic Questions

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11 mark

What is the correct formula for 1-fluro-3-methyl-2-butene?

A

Structural

CH2FCH2C(CH3)CH3

B

Empirical

C5H9F

C

Displayed

3-1-e-7a

D

Skeletal

    3-1-e-7b

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21 mark

Which of the following molecules are hydrocarbons?

6XkBEQnz_14

 

1

2

3

4

A

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B

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C

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D

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31 mark

What is the identity of the functional group that is ringed in the molecule shown below?

M3qovCdV_23

  • Aldehyde

  • Ketone

  • Carboxylic acid 

  • Alkene

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41 mark

What is the IUPAC name of the following molecule?

At88VQh2_24

  • 2-chloro-3-methylpentane

  • 3-methyl-4-chloropentane

  • 2-ethyl-3-chlorobutane

  • 2-chloro-3-ethylbutane

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11 mark

Limonene is found in the peel of citrus fruits.

q2-hard-3-1-introduction-to-organic-chemistry

What is the correct empirical and molecular formula of limonene?

 

Empirical Formula

Molecular formula

A

C9H13

C9H13

B

C5H9

C10H18

C

C10H8

C10H16

D

C5H8

C10H16

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21 mark

What is the correct structural formula for 2,2-dibromo-4-methylhexane?

  • CH3CHBrCBr(CH3)CH2CH2CH3

  • CH3CBr2CH(CH3)CH2CH2CH3

  • CH3CHBrCH(CH3)CHBrCH2CH3

  • CH3CBr2CH2CH(CH3)CH2CH3

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31 mark

What is the correct IUPAC name for the following molecule?

ocr-as-4-1h-mcq-q1-molecule

  • 4-ethyl-1,2,3-trimethylpent-2-ene

  • 3,4,5-trimethylhept-4-ene

  • 5-ethyl-3,4-dimethylhex-3-ene

  • 3,4,5-trimethylhept-3-ene

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41 mark

Which row is correct?

 

IUPAC name

General formula

Skeletal formula

Structural formula

A

2-methylpropanal

CnH2n+1O

2-methylpropanal

CH3CH(CH3)CHO

B

4-methylpentylamine

CnH2n+1NH2

 4-methylpentylamine

CH3CH2CH2CH(CH3)CH2NH2

C

4-methylhexan-2-one

CnH2nO

4-methylhexan-2-one

CH3CH2CH(CH3)CH2COCH3

D

ethyl propanoate

CnH2nO2

 ethyl-propanoate

CH3COOCH2CH2CH3

 

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11 mark

Compound A, an organic compound with a molecular formula C6H12O2, is produced by the oxidation of compound B, molecular formula C6H14O.

Which of the following functional groups does B contain?

  • Carboxyl (-COOH)

  • Carbonyl (C=O)

  • Hydroxyl (-OH)

  • Alkyl (RCOOR’)

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21 mark

What is the name of the following molecule?

q5-medium-3-1-introduction-to-organic-chemistry

  • 2,3,3-tetramethylpentane

  • 3,3,5-trimethylhexane

  • 2,4,4,4-trimethylethylbutane

  • 2,4,4-trimethylhexane

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31 mark

Which of the molecules shown below contains an aldehyde functional group?

  • CH3CH2CH2COCH3

  • CH3CH2OOCH3

  • H3CH2OCH2CH2CH2CH3

  • CHOCH2CHOHCH2CH3

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41 mark

Xylitol is an artificial sweetener used in toothpastes and chewing gum to improve their taste without impairing dental hygiene.

q1-medium-3-1-introduction-to-organic-chemistry

Which functional groups could be produced if xylitol is oxidised under suitable conditions?

 

Alkene

Aldehyde

Carboxylic acid

Ketone

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B

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C

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D

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