CŨNG CỐ ALKANE

Multiple Choice

Which of the following statements best describes a physical property of alkanes?

• Alkanes are soluble in water and have high melting points.

• Alkanes are insoluble in water but soluble in nonpolar solvents.

• Alkanes are always liquids at room temperature.

• Alkanes react readily with acids.

Multiple Choice

Which of the following statements best describes an alkane?

• Alkane là hợp chất hữu cơ chỉ chứa nguyên tử carbon và hydrogen trong phân tử.

• Alkane là hydrocarbon no chỉ có liên đơn C-C trong phân tử.

• Alkane là hydrocarbon no mạch hở chỉ có liên đơn C-C và C-H trong phân tử.

• Alkane là hydrocarbon no chỉ có liên đơn C-H trong phân tử.

Fill in the Blank

Fill in the blank: The general formula for alkanes is CnH___+2 (n ≥ 1).

Open Ended

Based on the boiling point chart of the first 6 alkanes, explain the trend observed as the number of carbon atoms increases.

Multiple Choice

Which of the following is NOT a method to reduce environmental pollution caused by the use of fuels from crude oil?

• Đưa thêm hợp chất chứa chì vào xăng để làm tăng chỉ số octane của xăng

• Đưa thêm chất xúc tác vào ống xả động cơ để chuyển hóa các khí thải độc hại

• Tăng cường sử dụng biogas

• Tổ chức thu gom và xử lí dầu cặn

Multiple Choice

Which of the following statements about the physical state of alkanes from C1 to C4 under normal conditions is correct?

• Tồn tại ở trạng thái khí

• Tồn tại ở trạng thái lỏng

• Tồn tại ở trạng thái rắn

• Tồn tại ở trạng thái plasma

Multiple Select

Select all correct statements about the industrial uses of alkanes.

• Các alkane C6, C7, C8 là nguyên liệu để sản xuất một số hydrocarbon thơm.

• Các alkane lỏng được sử dụng làm nhiên liệu như xăng hay dầu diesel.

• Các alkane từ C1 đến C20 được dùng làm nến và sáp.

• Propane C3H8 và butane C4H10 được sử dụng làm khí đốt.

Fill in the Blank

The general formula for alkyne is ___.

Open Ended

Explain the difference between alkene and alkyne in terms of their molecular structure and types of bonds present.

Multiple Choice

Which of the following compounds is an alkyne?

• H3C—CH3

• H2C=CH2

• HC≡CH

• H3C—CH=CH2

Multiple Select

Which of the following are types of isomerism found in alkenes?

• Chain isomerism

• Position isomerism

• Geometric isomerism

• Functional group isomerism

Open Ended

Describe the physical property differences between alkenes and alkynes as the number of carbon atoms increases.

Multiple Choice

What is the main product when ethene reacts with bromine water?

• Ethanol

• 1,2-dibromoethane

• Ethane

• Bromoethene

Open Ended

Explain the significance of the Markovnikov rule in the addition reactions of alkenes. Provide an example to illustrate your answer.

Multiple Choice

Which of the following statements correctly describes the difference between alkene and alkyne molecules?

• Alkene molecules contain at least one double bond (C=C), while alkyne molecules contain at least one triple bond (C≡C).

• Alkene molecules contain only single bonds, while alkyne molecules contain only double bonds.

• Alkene molecules contain at least one triple bond, while alkyne molecules contain at least one double bond.

• Alkene molecules contain only triple bonds, while alkyne molecules contain only single bonds.

Multiple Choice

Which of the following compounds is used as the direct raw material for the production of polyethylene (PE) by a direct polymerization reaction?

• Ethylene

• Propylene

• Propane

• Ethane

Fill in the Blank

Fill in the blank: In laboratory preparation, ethylene is commonly produced by dehydrating ___ using concentrated sulfuric acid.

Fill in the Blank

Fill in the blank: Benzene is a ___ hydrocarbon that contains a ring of six carbon atoms with alternating double bonds.

Multiple Choice

Which of the following statements about aromatic hydrocarbons (arenes) is correct?

• Arenes contain a benzene ring and exhibit special stability due to resonance.

• Arenes are always saturated hydrocarbons.

• Arenes do not undergo substitution reactions.

• Arenes are highly reactive towards addition reactions.

Open Ended

Explain the difference between complete and incomplete oxidation of alkyl side chains in arenes, using the reactions shown.

Multiple Choice

Which reaction conditions are required for the oxidation of the alkyl side chain in methylbenzene to potassium benzoate?

• Presence of concentrated H2SO4

• Presence of KMnO4 and heat

• Presence of UV light

• Presence of Ni catalyst

Fill in the Blank

The general formula for alkylbenzenes is CnH___-6 (n ≥ 6).

Multiple Choice

Which of the following statements about arenes is correct?

• Arenes are hydrocarbons that contain at least one benzene ring.

• Arenes are hydrocarbons that contain only aliphatic chains.

• Arenes are hydrocarbons that contain only single bonds.

• Arenes are hydrocarbons that contain only double bonds.

Open Ended

Why are arenes such as toluene and xylene commonly added to gasoline, and what is the environmental concern associated with their use?

Fill in the Blank

Alkanes are hydrocarbons with only ___ bonds between carbon atoms.

Open Ended

Summarize the key physical and chemical properties of alkanes that you learned in this lesson.