10-minute Quiz : Ch22 Chemical reactions of alkanes and alkenes

A molecule of compound P contains two carbon atoms. P can decolourize bromine water rapidly. Which of the following statements concerning P is correct?

• A. It can be represented by the general formula CₙH₂ₙ₊₂.

• B. It contains a carbon-hydrogen double bond.

• C. It is an unsaturated compound.

• D. It contains six hydrogen atoms in each molecule.

The relative molecular mass of an alkane is 44.0. Which of the following substances CANNOT be obtained from the cracking of the alkane?

(Relative atomic masses: H = 1.0, C = 12.0)

• A. H₂

• B. C₂H₄

• C. C₃H₆

• D. C₄H₈

Consider carbon compounds X to Z. Which of the following statements about these compounds are correct?

(1) They belong to the same homologous series.

(2) They have the same boiling point.

(3) All of them can decolourize acidified potassium permanganate solution.

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Which of the following is the balanced equation for the complete combustion of propane?

• A. C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(ℓ)
• B. C₃H₈(g) + 7O₂(g) → 3CO₂(g) + 8H₂O(ℓ)
• C. 2C₃H₈(g) + 7O₂(g) → 6CO(g) + 8H₂O(ℓ)
• D. 2C₃H₈(g) + 11O₂(g) → 6CO(g) + 16H₂O(ℓ)

Which of the following statements concerning free radicals MUST be correct?

(1) They have a short lifetime.

(2) They are negatively charged.

(3) They are highly reactive.

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Which of the following substances can be produced when propane reacts with chlorine in the presence of ultraviolet light?

(1) HCl

(2) C₆H₁₄

(3) C₃H₆Cl₂

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Which of the following hazard warning labels should be shown on a bottle of butane?

• A

• B

• C

• D

But-1-ene reacts with cold dilute acidified potassium permanganate solution to form compound Q. What is the systematic name of Q?

• A. Butan-1-ol

• B. Butan-2-ol

• C. Butane-1,2-diol

• D. Butane-1,3-diol

Which of the following processes is/are involved in producing propene from petroleum?

(1) Scrubbing

(2) Cracking

(3) Fractional distillation

• A. (1) only

• B. (2) only

• C. (1) and (3) only

• D. (2) and (3) only

Which of the following reagents can be used to distinguish between cylclohexane and cyclohexene?

• A. Acidified potassium dichromate solution
• B. Alkaline potassium permanganate solution
• C. Limewater
• D. Aqueous ammonia