Question 1

Which of these molecules is planar?

  A  

ethane, CH3CH3

  B  

ethanoic acid, CH3COOH

  C  

methanal, HCHO

  D  

methanol, CH3OH

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Question 2

Which compound exhibits both cis-trans and optical isomerism?

  A  

CH3CH=CHCH2CH3


  B  

CH3CHBrCH=CH2


  C  

CH3CBr=CBrCH3

  D  

CH3CH2CHBrCH=CHBr

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Question 3

Which compound is chiral?

  A  

1-chloro-3-methylbutane

  B  

2-chloro-2-methylbutane


  C  

2-chloro-3-methylbutane


  D  

3-chloropentane

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Question 4

Fructose is a sugar with more than one chiral centre. The fructose molecule is shown with X, Y and Z indicating three carbon atoms.

Which carbon atoms are chiral centres?

  A  

X, Y and Z

  B  

X and Y only 

  C  

X only

  D  

Y only

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Question 5

Which types of stereoisomerism are shown by 2,4-dimethylhex-2-ene?

  A  

both cis-trans isomerism and optical isomerism

  B  

cis-trans isomerism only

  C  

neither cis-trans isomerism nor optical isomerism

  D  

optical isomerism only

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Question 6

The diagram shows the structure of vitamin A.

How many chiral centres are present in one vitamin A molecule?

  A  

0

  B  

1

  C  

2

  D  

3

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Question 7

What is the structural formula of ethyl 3-methylbutanoate?

  A  

CH3CH2COOCH2CH2CH(CH3)2


  B  

CH3CH2COOCH(CH3)CH2CH3


  C  

CH3CH2CH(CH3)COOCH2CH3


  D  

(CH3)2CHCH2COOCH2CH3


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Question 8

What is the molecular formula of the steroid molecule below?

  A  

C18H24O2


  B  

C18H26O2


  C  

C18H28O2


  D  

C18H30O2


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Question 9

What is the number of chiral carbon atoms in the steroid molecule below?

  A  

5

  B  

6

  C  

7

  D  

8

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Question 10

In which molecule are all the atoms in the same plane?

  A  

CH3CHO

  B  

CH3NH2

  C  

C6H5Cl

  D  

C6H5CH3

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Question 11

Which is the correct general formula for non-cyclic compounds in the homologous series?

  A  

alcohols:                 CnH2n+2O

  B  

aldehydes:              CnH2n+1O

  C  

esters:                     CnH2n+1O2

  D  

primary amines:     CnH2n+2N

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