CHEM. MC

Question 1:

Methane

(1) exists as a gas at room temperature and pressure.

(2) reacts with chlorine through substitution in the presence of diffuse sunlight.

(3) is formed naturally by the decay of sea animals.

A. (1) and (2) only

B. (1) and (3) only

C. (2) and (3) only

D. All of them

Question 2:

Which of the following statements about methane is incorrect?

A. It is found in natural gas.

B. It is the chief component of Hong Kong town gas.

C. It is combustible.

D. It reacts with chlorine to form a variety of products under sunlight.

Question 3:

The boiling point of butane is higher than that of propane because

A. butane has a higher molecular size.

B. butane has a higher density.

C. butane needs more oxygen for complete combustion.

D. the bonding in butane is stronger than in propane.

Question 4:

Equal moles of chlorine and methane are allowed to react in diffuse sunlight.

Which of the following statements about the reaction are correct?

(1) The reaction is violent.

(2) A substitution reaction occurs.

(3) A mixture of CH3Cl, CH2Cl2, CHCl3, CCl4 and HCl is obtained.

A. (1) and (2) only

B. (1) and (3) only

C. (2) and (3) only

D. All of them

2

Question 5:

How many different organic product(s) can be obtained when chlorine reacts with

methane?

A. 1

B. 2

C. 3

D. 4

Question 6:

Ethane and butane

(1) contain hydrogen and carbon atoms only.

(2) belong to the same homologous series.

(3) have similar chemical properties but different physical properties.

A. (1) and (2) only

B. (1) and (3) only

C. (2) and (3) only

D. All of them

Question 7:

A saturated organic compound

(1) contains only single bonds between adjacent carbon atoms.

(2) decolorizes acidified potassium permanganate.

(3) undergoes mainly substitution reaction.

A. (1) only

B. (1) and (3) only

C. (2) and (3) only

D. All of them

1 個解答

評分
  • 最佳解答

    1) For (2), the H atom is sustituted by Cl atom, so correct.

    For (3), just observing that fossil fuels are formed from dead organisms millions of years ago, so it is correct.

    Ans = D

    2) Ans = B, since town gas has its chief component = hydrogen

    3) A, since larger molecular size implies greater intermolecular forces.

    4) D, the reaction between chlorine and methane is uncontrollable that we cannot choose which product(s) to be formed only.

    5) D, we can obtain CH3Cl, CH2Cl2, CHCl3 and CCl4

    6) D, since they belong to the same homologous series, they should have similar chemical properties.

    7) Saturated organic compounds cannot react with oxidizing agent.

    Ans = B

    資料來源: 原創答案
還有問題嗎?立即提問即可得到解答。