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CHAPTER NO 12
HYDROCARBONS
Encircle the most appropriate answer among the following options
1 Which among the following is’nt a hydrocarbon?
(a) Methane (CH4)
(b) Ethane (C2H6)
(c) Water (H20)
(d) Ethyne (C2H2)
2 Carbon has valency:
(a) 3
(b) 4 .
(c) 5
(d) 6
3 Which of the following property is not present in hydrocarbons?
(a) High melting point
(b) Non-polar property
(c) Solubility in non-polar solvent
(d) Poor conductivity:
4 Hydrocarbons having high molecular mass are:
(a) Gases
(b) Liquid
(c) Solids .
(d) All of these
5 Hydrocarbons having double bond are
(a) Alkane
(b) Alkene
(c) Alkyne
(d) Alkyl
6 Methane forms natural gas about
(a) 84% . . .
(b) 85%
(C) 86%
(d) 87%
7 The density of alkane increases with the increase of
(a) M.P
(b) B.P
(c) Molecular size
(d) Bonds.
8 Which are the characteristics property of alkanes
(a) Displacement reactions
(b) Double displacement reaction
(c) Substitution reaction
(d) Redox reaction
9 Incomplete combustion of alkanes produce
(a) Carbon dioxide
(b) Oxygen
(c) Chlorine gas
(d) Carbon monoxide
10 Alkynes being more reactive than
(a) Alkanes .
(b) Alkenes
(c) Both a & b
(d) None of these
11 Dehydrohalogenation of alkyl halides take place in the presence of
(a) Alcoholic KOH
(b) Aqueous NaCl
(c) Alcoholic NaCl
(d) Aqueous KOH
12 A solution of bromine in water having colour
(a) Dark brown’
(b) Purple
(c) Red – brown
(d) Violet
13 Traces of acetylene are present in coal gas about
(a) 0.06%
(b) 0.07%
(c) 0.08%
(d) 0.09%
14 What is the formula of methane
(a) CH3
(b) CH4
(c) CH2
(d) C2H5
15 Formula of nascent hydrogen is
(a) H2
(b) [H]
(c) H3
(d) All of these
16 Which of the following is not an organic solvent
(a) C2H5OH
(b) CHCl3
(c) CCI4
(d) H2O
17 Methane is also called
(a) Marsh gas
(b) Inert gas
(c) Natural gas
(d) Both (a) and (c).
18 Alkenes is also called
(a) Paraffins
(b) Olefins
(c) Acetylenes
(d) All of above
19 · Ethene reacts with H2SO4 at temperature of
(a) 150°C
(b) 16°C
(c) 180°C
(d) 453 K
20 Banaspati Ghee is also called
(a) Vegetable oil
(b) Margarine
(c) Cooking oil
(d) Coconut oil
21 Ethylene oxide is used as
(a) Anti-freezer
(b) Solvent
(c) Fumigant
(d) Poisonous mustard gas
22 Banana when riped produces gas
(a) Ethene
(b) Methane
(c) Noble gas
(d) Oxygen gas
23 Addition of hydrogen is called
(a) Reduction
(b) Oxidation
(c) Redox
(d) All of these
24 Which of the following is not a example of open chain hydrocarbon
(a) CH4
(b) C3H2
(c) C2H6
(d) C6H6
25 Number of bonds present in methane
(a) 2
(b) 3
(c) 4
(d) 5
26 Which of the following is not a function of chloroform
(a) Solvent in rubber
(b) Dry cleaning
(c) Solvent in waxes
(d) Anaesthesia
27 Which of the following has higher energy
(a) Alkane
(b) Alkene
(c) Alkyne
(d) All of these
28 Which is used as Antifreeze
(a) Di-ethyl ether
(b) Ethyl alcohol
(c) Ethylene oxide
(d) Ethylene glycol
29 Alkanes are also called
(a) Paraffins
(b) Olefins
(c) Acetylenes
(d) Acetaldehyde
30 Due to increase in molar mass which property increases
(a) B.P
(b) M.P
(c) Volatility
(d) Both a & b
31 The compound having at least one benzene ring are called
(a) Aromatics
(b) Alkane
(c) Alkene
(d) Alkyne
32 What is the most necessary condition for the reaction of CH4 with halogen?
(a) Catalyst
(b) Pressure
(c) Sunlight
(d) High temperature
33 Glyoxal is oxidize into
(a) KMnO4
(b) Glycol
(c) Oxalic acid
(d) Acetic acid
34 The example of rubber’s are:
(a) Neoprene
(b) Butadiene
(c) Chloroprene
(d) Furan
35 Which among the following is a synthetic fibre
(a) Nylon
(b) Rayon
(c) Polyesters
(d) All of these
36 Detergents are the sodium salts of
(a) Sulphuric acid
(b) Alkyl hydrogen sulphite
(c) Sodium carbonate
(d) Cholesteryl benzoate
37 Due to which property alkane are used a fuel
(a) Combustion
(b) Halogenation
(c) Oxidation
(d) Reduction
38 Alcohol is soluble in water due to
(a) Hydrogen bonding,
(b) Lone pair of water
(c) Covalent bonding
(d) All of above
39 Which of the following is not alcohol
(a) C2H5OH
(b) C3HOH
(c) CH3OH
(d) Ca(OH)2
40 paraffins means
(a) Highly reactive
(b) Less reactive
(c) Oil forming
(d) None of these
41 Number of bonds in propene is
(a) 6
(b) 7.
(c) 8
(d) 9
42 Which compound is used for welding process
(a) CH4
(b) KMnO4
(c) Acetylene
(d) Ethylene
43 Amorphous forms of carbons are
(a) Coal
(b) Charcoal
(c) Carbon black
(d) All of these
44 Alkenes are insoluble in
(a) Organic solvent
(b) Alcohol
(c) Water (H2O)
(d) Both b&c
45 Which of the following does not occur free in nature
(a) Ethylene
(b) Acetylene
(c) Propylene
(d) Pentene
46 The formula of oxalic acid is
(a) (COOH)2
(b) HCOOH
(c) CH3COOH
(d) COOH
47 Alkyne forms
(a) Single bond
(b) Double bond
(c) Triple bond
(d) Ionic bond
48 Di-methyl acetylene is also called
(a) Ethyne
(b) Propyne
(c) Butyne
(d) Hexane
49 Which one of the following is a substitution reaction
(a) Halogenation of alkane
(b) Dehydration of alkane
(c) Hydrolysis of alkane
(d) Hydrogenation
50 Alkanes having carbon range are liquid
(a) C4 to C6.
(b) C5 to C10
(c) C8 to C10.
(d) Both a & b