Hydrocarbons Test 01

Total Questions: 21

1 - If an organic compound has 4 carbon atoms, all singly bonded, it will have the following characteristics except one:

A ) It will be saturated hydrocarbon
B ) It will have 8 hydrogen atoms ✅
C ) Its name will be and - butane
D ) It will be least reactive

2 - The reduction of alky1 halides takes place in the presence of:

A ) Zn/ HCI ✅
B ) Na/HCI
C ) Mg/HCI
D ) Cu/HCI

3 - Halogenation methane produces following valuable chemical compounds used as solvents except:

A ) Carbon tetrachloride
B ) chloroform
C ) carbon black ✅
D ) chloromethane

4 - Incomplete combustion of alkanes produces:

A ) carbon dioxide only
B ) carbon monoxide only
C ) carbon monoxide and carbon black ✅
D ) carbon dioxide and carbon black

5 - Alkenes are prepared from alcohols by a process called:

A ) dehydrogenation
B ) dehalogenation
C ) dehydration ✅
D ) dehydrohalogenation

6 - Dehydrohalogenation takes place in the presence of:

A ) NaOH (aqueous)
B ) alcoholic KOH ✅
C ) aqueous KOH
D ) alcoholic NaOH

7 - Oxidization of ethene with KMnO4 produces:

A ) oxalic acid
B ) glyoxal
C ) ethane glycol ✅
D ) propane glycol

8 - The end product of oxidation of acetylene is:

A ) oxalic acid ✅
B ) glycol
C ) glyoxal
D ) none of these

9 - Dehalogenation of tetrachlorides produces acetylene. This reaction takes place in the presence of:

A ) Sodium metal
B ) Zinc metal ✅
C ) magnesium metal
D ) potassium metal

10 - Substitution reaction is the characteristics of:

A ) alkanes ✅
B ) alkenes
C ) alkynes
D ) none of these

11 - Halogenation of alkanes in the presence of diffused sunlight takes place:

A ) suddenly, only in one step
B ) slowly in one step
C ) in a series of four steps ✅
D ) fastly in two steps

12 - Which one of the following is a substitution reaction?

A ) halogenation of alkynes
B ) halogenation of alkynes
C ) halogenation of alkanes ✅
D ) bromination of alkenes

13 - The order of reactivity of hydrogen halides with alkenes is:

A ) HI > HBr ✅
B ) HBr > HI
C ) HCI > HBr
D ) HBr < HCI

14 - Oxidation of alkanes produces:

A ) glyoxal
B ) glycol ✅
C ) oxalic acid
D ) formic acid

15 - Carbonn black is used in the manufacture of:

A ) dry cleaning agents
B ) shoe polishes ✅
C ) fertilizers
D ) none of the above

16 - Alkanes give reaction only:

A ) addition
B ) decomposition
C ) substitution ✅
D ) displacement

17 - Alkenes are produced in large amounts by cracking of:

A ) natural gas
B ) Petroleum ✅
C ) benzene
D ) xylol

18 - Traces of acetylene are present in coal gas about:

A ) 0.06% ✅
B ) 0.08%
C ) 1.1%
D ) 90%

19 - Which of the following gas is used in warfare?

A ) methane
B ) ethane gas
C ) mustard gas ✅
D ) none of these

20 - Alkanes do not react in:

A ) diffused sunlight
B ) bright sunlight
C ) dark ✅
D ) none of these

21 - Which one of the following is more reactive?

A ) methane
B ) ethane
C ) ethene ✅
D ) acetylene