AS & A Level Chemistry 13.3 Shapes of organic molecules; $\sigma$ and $\pi$ bonds: Exam Style Questions Paper 1

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Question

When considering one molecule of ethene, which row describes both the hybridisation of the atomic orbitals in the carbon atoms and the overall bonding

▶️Answer/Explanation

Ans:B

Question:

 The diagram shows the structure of compound Q. 

Two of the rings, X and Y, contain a C=C bond. Which row is correct?

▶️Answer/Explanation

Ans:D

Question

Structural isomerism and stereoisomerism should be considered when answering this question.
How many isomers with the formula $\mathrm{C}_4 \mathrm{H}_8$ have structures that contain a $\pi$ bond?
A 1
B 2
C 3
D 4

▶️Answer/Explanation

Ans:D

Question

Which row of the table is correct?

▶️Answer/Explanation

Ans:A

Question

People who take statin drugs to control their blood cholesterol may also take ‘coenzyme $Q_{10}$ ‘. The diagram shows a simplified structure of one form of this coenzyme.

Which row describes this structure correctly?

▶️Answer/Explanation

Ans:D

Question

Which row is correct?

Answer/Explanation

Answer       A

Question

The structure of tiglic acid is CH3CH=C(CH3)CO2H.

Which statements about the properties of one molecule of this acid are correct?

1 It contains two π bonds.
2 It contains four lone pairs of electrons.
3 It has all its atoms in the same plane.

▶️Answer/Explanation

Answer     B

Question

Four compounds are shown.

                                   C2H4                 C2H5OH               CH3CHO                 CH3CO2H
How many of these compounds have an odd number of σ bonds?

A 1                 B 2                C 3                D 4

Answer/Explanation

Answer     B

Question

The diagrams show two different compounds.

What is
● the total number of structural isomers, including compound 2, that could be formed
by adding a second methyl group to the ring of compound 1,
● the number of π electrons in each compound?

Answer/Explanation

Answer     D

Question

Which elements can form π bonds in their compounds?

1 carbon
2 oxygen
3 nitrogen

Answer/Explanation

Answer:     A

 Question

The diagrams show two different compounds.

What is

      • the total number of structural isomers, including compound 2, that could be formed by adding a second methyl group to the ring of compound 1,
      • the number of π electrons in each compound?

Answer/Explanation

Answer:     D

Question

The double bond between the two carbon atoms in an ethene molecule consists of one σ bond and one π bond.
Which orbitals overlap to form each of these bonds?

Answer/Explanation

Ans:A

Question

 Carvone is found in spearmint.

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

Answer/Explanation

Ans:

D

Question

What is always involved in a carbon-carbon π bond?

  1. a shared pair of electrons
  2. a sideways overlap of p orbitals
  3. delocalised electrons

Answer/Explanation

Ans:

B

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