Addition of hydrogen to ethene forms
1. methane
2. propane
3. butane
4. ethane
1.
2.
First three members of alkynes are
1.solids
2.liquids
3.gases
4.plasma
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
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
What is the state of Trichloromethane at room temperature?
1. solid
2. liquid
3.gas
4.plasma
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
Acetylene is another name of
1. ethene
2. propene
3.butene
4. pentene
After the first three members the next eight members of alkynes are
1. solids
2. liquids
3. gases
4. plasma
Alkanes (saturated hydrocarbons) have a density
1. less than water
2. equal to water
3. more than water
4.more than mercury
Alkanes that contain 5 to 17 atoms are in
1. solid state
2. liquid state
3. gaseous state
4. plasma state
C5-C15 members of alkenes are
1.solids
2. liquids
3. gases
4. plasma
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
Each carbon atom in an alkane forms
1. one bond
2. two bonds
3. three bonds
4. four bonds
Each Hydrogen atom in an alkane forms
1. one bond
2. two bonds
3. three bonds
4. four bonds
Ethene propene and butene are
1. solids
2. liquids
3.gases
4. plasma
Ethylene glycol is used as an
1. ripening agent
2. fertilizer
3. titrating agent
4. anti-freeze
Higher members of alkenes are
1. solids
2. liquids
3. gases
4. plasma
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
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
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
in alkenes the two carbon atoms forming double bond are joined to how many atoms?
1.one
2.two
3.three
4.four
Loss of hydrogen halide from alkyl halide gives
1.alkenes
2.alkanes
3.alkynes
4.halogens
Methane (CH4) is used as
1. domestic fuel
2. automobile fuel
3. urea manufacture
4. all of above
Methane is reacted with chlorine in
1. direct sunlight
2. darkness
3. diffused sunlight
4. any environment
Test for the presence of an alkene is called
1. iodine test
2. benedicts test
3. Baeyers test
4. Kolbes electrolytic method
Tetra halides undergo dehalogenation forming an alkyne on treatment with
1.calcium hydroxide
2. alcoholic potassium hydroxide
3. sodium hydroxide
4.Zn dust
Tetrahydroxy ethane loses two water molecules to form
1. oxalic acid
2. Glyoxal
3. acetylene
4. ethylene glycol
The molecular formula of methane is
1. CH4
2.C2H6
3.C3H8
4.C4H10
the odor of Ethyne is
1. garlic like
2. ginger like
3. strawberry like
4. petrol like
The odor of Ethyne is
1. onion like
2. garlic like
3. vinegar like
4. fruity
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
The reaction of any substance with air is called
1.carbation
2.halogenation
3.sublimation
4.combustion
The red color of tomatoes is due to alkene named
1. ethene
2. propene
3. lycopene
4.butene
Trichloromethane is also called
1.chlorophyll
2. chloroplast
3. chloromethane
4.chloroform
What causes the red color of tomatoes?
1. lycopene
2. ethene
3. ethylene glycol
4. acetylene
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
What is the color of bromine?
1.brown
2.red
3.orange
4.reddish-brown
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
What is the physical state of alkanes containing five to seventeen carbon atoms?
1.solid
2.liquid
3.gas
4.plasma
What is the physical state of bromine when reacted with an alkene?
1. solid
2. liquid
3. gas
4. plasma
What is the state of dichloromethane at room temperature?
1. solid
2.liquid
3. gas
4. plasma
What is the state of methyl chloride at room temperature?
1. solid
2. liquid
3. gas
4. plasma
What is the state of tetrachloromethane at room temperature?
1. solid
2. liquid
3. gas
4. plasma
What is the term used for the reaction of an alkane and a halogen?
1. substitution reaction
2. elimination reaction
3. Dehydrohalogenation
4. hydrogenation
When bromine water is added to an alkene the product is
1. red
2. orange
3.colorless
4. reddish-brown
When do alkanes readily react with halogens?
1. in darkness
2. in sunlight
3. all the time
4. none of above
When methane and chlorine are reacted in direct sunlight the reaction is
1.normal
2.explosive
3.faster
4.cheaper
Which alkanes are widely used as fuel?
1. lighter alkanes
2. heavier alkanes
3. all the alkanes
4. alkenes
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
Which of the following has carcinogenic effects at high concentrations?
1. tetra chloromethane
2.dichloromethane
3. methyl chloride
4. Trichloromethane
Which of the following has two halogen atoms on adjacent carbon atoms?
1. vicinal dihalide
2. Tetrahalide
3. acetylene
4. Trichloromethane
Which of the following helps to initiate the ripening of fruits and vegetables?
1. ethane
2. ethene
3.Ethyne
4.methane
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
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
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
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
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
Which of the following is used in oxy-acetylene torches for welding and cutting metals?
1.Ethyne
2.ethene
3.ethane
4.methane
Which of the following processes involves the addition of hydrogen molecule across carbon-carbon multiple-bond?
1. dehydration
2. Dehydrohalogenation
3. dehalogenation
4. hydrogenation