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CAIE A-Level Chemistry AS 13.3 Shapes of Organic Molecules and Bonds Questions

Practise relating sp, sp2 and sp3 hybridisation to molecular shape, bond angles, planarity and sigma/pi bonding.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • assign sp, sp2 or sp3 hybridisation from the number and arrangement of electron domains
  • state the corresponding linear, trigonal planar or tetrahedral geometry and approximate bond angle
  • count sigma and pi bonds and represent side-on p-orbital overlap in a multiple bond

Covered syllabus points

13.3.1—Organic molecules as either straight-chained,13.3.2—Shape of, and bond angles in, molecules13.3.3—Arrangement of σ and π bonds in molecules13.3.4—Terms: planar when describing the arrangement

Question 1

[Maximum number: 1]

Histidine is an amino acid.

histidine

histidine

What are the approximate bond angles 1,2 , and 3 ?

1

2

3

109.5∘109.5^{\circ}

107∘107^{\circ}

90∘90^{\circ}

120∘120^{\circ}

107∘107^{\circ}

109.5∘109.5^{\circ}

120∘120^{\circ}

120∘120^{\circ}

90∘90^{\circ}

120∘120^{\circ}

120∘120^{\circ}

109.5∘109.5^{\circ}

Question 2

[Maximum number: 1]

How many σ\sigma and π\pi bonds are in the molecule HCCCH2CH2CHC(CH3)2\mathrm{HCCCH}_{2} \mathrm{CH}_{2} \mathrm{CHC}\left(\mathrm{CH}_{3}\right)_{2} ?

A

17σ3π17 \sigma 3 \pi

B

17σ5π17 \sigma 5 \pi

C

18σ4π18 \sigma 4 \pi

D

19σ3π19 \sigma 3 \pi

Question 3

[Maximum number: 1]

In which molecules do all the carbon atoms lie in the same plane?
1 2,3-dimethylbut-2-ene
2 propane
3 cyclohexane

A

1, 2 and 3 are correct

B

1 and 2 only are correct

C

2 and 3 only are correct

D

1 only is correct

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