ASChemistryCambridge (CIE)Exam Questions13. An Introduction to AS Level Organic ChemistryShapes of Organic Molecules; σ & π Bonds

Shapes of Organic Molecules; σ & π Bonds (Cambridge (CIE) AS Chemistry): Exam Questions

Exam code: 9701

1 hour16 questions

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Shapes of Organic Molecules; σ & π Bonds

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1
1 mark

How many π bonds are present in one molecule of ethene?

  • 0

  • 1

  • 2

  • 3

Choose your answer

2
1 mark

Which type of bond is formed by the sideways overlap of p orbitals?

  • dative covalent bond

  • hydrogen bond

  • π bond

  • σ bond

Choose your answer

3
1 mark

How many σ bonds and π bonds are present in a double bond?

σ bonds

π bonds

A

0

2

B

1

1

C

1

2

D

2

0

    Choose your answer

    4
    1 mark

    What is the hybridisation of the carbon atom in methane?

    • sp

    • sp2 

    • sp3 

    • sp4

    Choose your answer

    5
    1 mark

    Which molecule is a straight-chain hydrocarbon?

    • 2-methylpropane

    • benzene

    • cyclopentane

    • propane

    Choose your answer

    1
    1 mark

    Methyl isocyanate, CH3NCO, is a toxic liquid which is used in the production of adhesives.

    The sequence of atoms in a methyl isocyanate molecule is H3C—N=C=O.

    What is the approximate angle between the bonds formed by the N atom?

    • 107°

    • 109.5°

    • 120°

    • 180°

    Choose your answer

    2
    1 mark

    The diagram shows part of the structure of cysteine, an amino acid, with three bond angles labelled.

    Chemical structure of the amino acid cysteine, with bond angles labelled x, y and z

    What is the correct order of the bond angles x, y and z, from smallest to largest?

    • x < y < z

    • x < z < y

    • z < x < y

    • z < y < x

    Choose your answer

    3
    1 mark

    What is the minimum number of carbon atoms required to form a chiral acyclic alkane?

    • 6

    • 7

    • 9

    • 11

    Choose your answer

    1
    1 mark

    What is the bond angle around an sp2 hybridised carbon atom?

    • 104.5°

    • 109.5°

    • 120degree

    • 180degree

    Choose your answer

    2
    1 mark

    The structure of the amino acid cysteine is shown.

    Structural formula of cysteine showing three carbon atoms: the carboxyl carbon with a C=O double bond, the alpha-carbon bonded to four different groups, and the beta-carbon bonded to the thiol group

    How many carbon atoms in a molecule of cysteine are sp2 hybridised?

    • 0

    • 1

    • 2

    • 3

    Choose your answer

    3
    1 mark

    Limonene is found in the peel of citrus fruits.

    Skeletal formula of limonene showing a six-membered carbon ring with an isopropenyl substituent and one endocyclic double bond, giving two C=C double bonds in total

    How many σ and π bonds are present in this molecule?

    σ

    π

    A

    12

    2

    B

    22

    4

    C

    24

    4

    D

    26

    2

      Choose your answer