Test Yourself : Ch22 Chemical reactions of alkanes and alkenes

Which of the following statements concerning alkanes is/are INCORRECT?

(1) They are saturated hydrocarbons.

(2) They burn completely to form carbon dioxide and water in the air.

(3) They decolourize bromine (dissolved in an organic solvent) rapidly under room conditions.

• A. (1) only
• B. (2) only
• C. (1) and (3) only
• D. (2) and (3) only

Which of the following statements concerning the reaction between one mole of methane and four moles of bromine (dissolved in an organic solvent) under suitable conditions are correct?

(1) It gives a mixture of products.

(2) The major product is bromomethane.

(3) It gives a trace of ethane.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Tags

NGSS.HS-PS1-1

Which of the following statements concerning catalytic cracking in an oil refinery are correct?

(1) It heats heavy petroleum fractions in the absence of air.

(2) It uses aluminium oxide mixed with silicon dioxide as the catalyst.

(3) It uses distillation to separate the mixture of hydrocarbons produced after cracking.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Tags

NGSS.HS-PS1-5

The following equation shows the cracking of an alkane with 18 carbon atoms:

C₁₈H₃₈ → C₁₀H₂₂ + 2Y

What is the molecular formula of Y?

• A. C₄H₈
• B. C₄H₁₀
• C. C₈H₁₆
• D. C₈H₁₈

Which of the following is/are unsaturated hydrocarbon(s)?

(1) CH≡CH

(2) CH₃CH₂OH

(3) CH₃CH=CH₂

• A. (1) only
• B. (2) only
• C. (1) and (3) only
• D. (2) and (3) only

Which of the following statements concerning alkenes are correct?

(1) They undergo addition reactions with chlorine.

(2) The reaction between an alkene and bromine forms a single product.

(3) For alkanes and alkenes with the same number of carbon atoms, alkenes burn more completely with a less sooty flame than the corresponding alkanes.

• 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 decolourized by propene?

(1) Acidified potassium dichromate solution

(2) Acidified potassium permanganate solution

(3) Bromine (dissolved in an organic solvent)

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

What is the systematic name of the product in the reaction between but-1-ene and chlorine?

• A. 1,1-dichlorobutane
• B. 1,2-dichlorobutane
• C. 2,2-dichlorobutane
• D. 3,4-dichlorobutane