R4RIN – MCQs, Mock Tests | CBES Board Class 10 Chemistry Hydrocarbons multiple choice questions set 2

What is the color of bromine?

1. brown
2. red
3. orange
4. reddish-brown

✅ Correct Answer: 4

Each Hydrogen atom in an alkane forms

1. one bond
2. two bonds
3. three bonds
4. four bonds

✅ Correct Answer: 1

The reaction of halogens (Group-VII) and alkane (saturated hydrocarbons) in the presence of sunlight is an example of

1. carbation
2. halogenation
3. substitution
4. hydrogenation

✅ Correct Answer: 3

Considering the process of reduction of alkyl halides which of the following is liberated when Zn reacts with aqueous acid?

1. hydrogen gas
2. nascent hydrogen
3. oxygen
4. carbon atoms

✅ Correct Answer: 2

What is the state of Trichloromethane at room temperature?

1. solid
2. liquid
3. gas
4. plasma

✅ Correct Answer: 2

Methane (CH4) is used as

1. domestic fuel
2. automobile fuel
3. urea manufacture
4. all of above

✅ Correct Answer: 4

What is the physical state of bromine when reacted with an alkene?

1. solid
2. liquid
3. gas
4. plasma

✅ Correct Answer: 4

Tetrahydroxy ethane loses two water molecules to form

1. oxalic acid
2. Glyoxal
3. acetylene
4. ethylene glycol

✅ Correct Answer: 2

Tetra halides undergo dehalogenation forming an alkyne on treatment with

1. calcium hydroxide
2. alcoholic potassium hydroxide
3. sodium hydroxide
4. Zn dust

✅ Correct Answer: 4

Which of the following is true about alkanes?

1. they are insoluble in water
2. they are more dense than water
3. they are essentially polar
4. they are reactive towards most ionic compounds

✅ Correct Answer: 1

Which of the following has carcinogenic effects at high concentrations?

1. tetra chloromethane
2. dichloromethane
3. methyl chloride
4. Trichloromethane

✅ Correct Answer: 1

Which color of KMnO4 solution is discharged when an alkene is treated with a dilute alkaline aqueous solution of KMnO4?

1. red
2. brown
3. orange
4. pink

✅ Correct Answer: 4

Which of the following has two halogen atoms on adjacent carbon atoms?

1. vicinal dihalide
2. Tetrahalide
3. acetylene
4. Trichloromethane

✅ Correct Answer: 1

Trichloromethane is also called

1. chlorophyll
2. chloroplast
3. chloromethane
4. chloroform

✅ Correct Answer: 4

Loss of hydrogen halide from alkyl halide gives

1. alkenes
2. alkanes
3. alkynes
4. halogens

✅ Correct Answer: 1

The reaction of any substance with air is called

1. carbation
2. halogenation
3. sublimation
4. combustion

✅ Correct Answer: 4

Vicinal dihalide eliminates two molecules of hydrogen halides from adjacent carbon atoms on treatment with :

1. Zn dust
2. calcium hydroxide
3. alcoholic potassium hydroxide
4. calcium chloride

✅ Correct Answer: 3

Which of the following is not true about alkynes?

1. they are unsaturated hydrocarbons
2. they are saturated hydrocarbons
3. they are non-polar
4. they dissolve readily in organic solvents

✅ Correct Answer: 2

in alkenes the two carbon atoms forming double bond are joined to how many atoms?

1. one
2. two
3. three
4. four

✅ Correct Answer: 3

What is the physical state of alkanes containing five to seventeen carbon atoms?

1. solid
2. liquid
3. gas
4. plasma

✅ Correct Answer: 2

First three members of alkynes are

1. solids
2. liquids
3. gases
4. plasma

✅ Correct Answer: 3

Which of the following is not true about alkenes?

1. they are unsaturated hydrocarbons
2. they are insoluble in water
3. they are soluble in organic solvents such as alcohol
4. they are soluble in water

✅ Correct Answer: 4

Which of the following is used in oxy-acetylene torches for welding and cutting metals?

1. Ethyne
2. ethene
3. ethane
4. methane

✅ Correct Answer: 1

The molecular formula of methane is

1. CH4
2. C2H6
3. C3H8
4. C4H10

✅ Correct Answer: 1

What is formed when methane is reacted with chlorine in direct sunlight?

1. carbon and HCl
2. carbon tetrachloride and HCl
3. chloromethane
4. dichloromethane

✅ Correct Answer: 1

Which of the following is true about alkynes?

1. they are polar
2. they do not dissolve in organic solvents
3. they are saturated hydrocarbons
4. they are non-polar

✅ Correct Answer: 4

Which of the following helps to initiate the ripening of fruits and vegetables?

1. ethane
2. ethene
3. Ethyne
4. methane

✅ Correct Answer: 2

Test for the presence of an alkene is called

1. iodine test
2. benedicts test
3. Baeyers test
4. Kolbes electrolytic method

✅ Correct Answer: 3

The red color of tomatoes is due to alkene named

1. ethene
2. propene
3. lycopene
4. butene

✅ Correct Answer: 3

Which of the following is not true about alkanes?

1. they are non-polar
2. they are less dense than water
3. they are insoluble in water
4. they are reactive towards most ionic compounds

✅ Correct Answer: 4

Each carbon atom in an alkane forms

1. one bond
2. two bonds
3. three bonds
4. four bonds

✅ Correct Answer: 4

The reaction in which -OH group is removed from one carbon and H atom from the adjacent carbon atom is called

1. substitution reaction
2. addition reaction
3. elimination reaction
4. dehydration

✅ Correct Answer: 3

Alkanes (saturated hydrocarbons) have a density

1. less than water
2. equal to water
3. more than water
4. more than mercury

✅ Correct Answer: 1

the odor of Ethyne is

1. garlic like
2. ginger like
3. strawberry like
4. petrol like

✅ Correct Answer: 1

C5-C15 members of alkenes are

1. solids
2. liquids
3. gases
4. plasma

✅ Correct Answer: 2

What is the correct trend in the reactivity of halogen with an alkane?

1. F2 > Cl2> Br2 > I2
2. I2 > Cl2 > Br2 > F2
3. Br2 > Cl2 > F2 > I2
4. F2 > Br2 > Cl2 >I2

✅ Correct Answer: 1

Alkanes that contain 5 to 17 atoms are in

1. solid state
2. liquid state
3. gaseous state
4. plasma state

✅ Correct Answer: 2

How does bromine react?

1. explosively
2. slowly in dark but rapidly in strong sunlight
3. requires high temperature or strong sun light
4. essentially unreactive

✅ Correct Answer: 3

When do alkanes readily react with halogens?

1. in darkness
2. in sunlight
3. all the time
4. none of above

✅ Correct Answer: 2

Which alkanes are widely used as fuel?

1. lighter alkanes
2. heavier alkanes
3. all the alkanes
4. alkenes

✅ Correct Answer: 1

What is the state of dichloromethane at room temperature?

1. solid
2. liquid
3. gas
4. plasma

✅ Correct Answer: 2

When bromine water is added to an alkene the product is

1. red
2. orange
3. colorless
4. reddish-brown

✅ Correct Answer: 3

Ethylene glycol is used as an

1. ripening agent
2. fertilizer
3. titrating agent
4. anti-freeze

✅ Correct Answer: 4

How much ethene is required for the ripening of 1 kg of tomatoes?

1. 1 mg
2. 100 mg
3. 10 mg
4. 0.1 mg

✅ Correct Answer: 4

What is the state of tetrachloromethane at room temperature?

1. solid
2. liquid
3. gas
4. plasma

✅ Correct Answer: 2

Which of the following processes involves the addition of hydrogen molecule across carbon-carbon multiple-bond?

1. dehydration
2. Dehydrohalogenation
3. dehalogenation
4. hydrogenation

✅ Correct Answer: 4

After the first three members the next eight members of alkynes are

1. solids
2. liquids
3. gases
4. plasma

✅ Correct Answer: 2

What is the term used for the reaction of an alkane and a halogen?

1. substitution reaction
2. elimination reaction
3. Dehydrohalogenation
4. hydrogenation

✅ Correct Answer: 1

Which of the following is used as a simple test for the presence of unsaturation?

1. red colour of bromine solution
2. Decolourization of bromine solution
3. orange colour of bromine solution
4. none of above

✅ Correct Answer: 2

How does fluorine react?

1. explosively
2. slowly in dark but rapidly in strong sunlight
3. requires high temperature or strong sun light
4. essentially unreactive

✅ Correct Answer: 1

Higher members of alkenes are

1. solids
2. liquids
3. gases
4. plasma

✅ Correct Answer: 1

Addition of hydrogen to ethene forms

1. methane
2. propane
3. butane
4. ethane

✅ Correct Answer: 4

The odor of Ethyne is

1. onion like
2. garlic like
3. vinegar like
4. fruity

✅ Correct Answer: 2

What causes the red color of tomatoes?

1. lycopene
2. ethene
3. ethylene glycol
4. acetylene

✅ Correct Answer: 1

Acetylene is another name of

1. ethene
2. propene
3. butene
4. pentene

✅ Correct Answer: 1

Ethene propene and butene are

1. solids
2. liquids
3. gases
4. plasma

✅ Correct Answer: 3

What is the state of methyl chloride at room temperature?

1. solid
2. liquid
3. gas
4. plasma

✅ Correct Answer: 3

Methane is reacted with chlorine in

1. direct sunlight
2. darkness
3. diffused sunlight
4. any environment

✅ Correct Answer: 3

When methane and chlorine are reacted in direct sunlight the reaction is

1. normal
2. explosive
3. faster
4. cheaper

✅ Correct Answer: 2

1.
2.
3.
4.

✅ Correct Answer: 0