ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 19 Aliphatic Hydrocarbons

Try The MCQ's Test For ECAT Chemistry Chapter 19 Aliphatic Hydrocarbons

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ECAT Chemistry Chapter 19 Aliphatic Hydrocarbons

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Question # 1

The order of reactivity of halogens in aliphatic substitution reactions is

Question # 2

Benzene is not prepared from

Question # 3

Free radical mechanism of halogenation of alkanes follow step:

Question # 4

Preparation of vegetable ghee involves

Question # 5

CnH2nis the general formula of

Question # 6

The general formula of alkane is

Question # 7

During nitration of benzene, the active nitrating agent is

Question # 8

For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to

Question # 9

Acetylene is used in the manufacture of

Question # 10

The nitration of benzene takes place when it is heated with a mixture of conc.HNO3and conc. H2SO4at 50°C in ratio of

Question # 11

The hydrocarbons having double bonds normally end with suffix

Question # 12

When an aqueous solution of potassium salt of monocarboxylic acid is subjected to electrolysis, corresponding alkane is formed. This reation is known as

Question # 13

Reaction of ethanes with KMnO4 gives:

Question # 14

The term aromatic was derives from

Question # 15

Which reaction is too vigorous to control

Question # 16

Vinyl acetylene combines with HCl to form:

Question # 17

Sulphuric acid generates nitronium ion by reacting with

Question # 18

Hybridization of each carbon atom in benzene ring is

Question # 19

The process in which orbitals of different energies and shapes mix with each other to give equivalent hybrid orbitals is called

Question # 20

Which is more active ?

Question # 21

Benzene is obtained from benzene sulphonic acid by treating with

Question # 22

What is not a common use of methane

Question # 23

Odour of alkene is:

Question # 24

Which is the used as test for the presence of alkenes

Question # 25

The addition of HBr is easiest with

Question # 26

The geometry of acetylene is

Question # 27

Which decolourizes the colour of Br3

Question # 28

B-B'-dichloroethyl sulphide is commonly known as

Question # 29

Write the name of following compound

Question # 30

Raney - nickel is the alloy of Ni with

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Sr.# Question Answer
1 Kolb's method has limited synthetic applications due to
A. Expensive catalysis
B. Slow reaction
C. Number of side products produced
D. Salts used are very expensive
2 The method involved for electrolysis of Na or K salts of carboxylic acids
A. Sabatier's sendrens reaction
B. Kolbe's method
C. Clemmensen
D. Wolf kishner reduction
3 The presence of a double bond in a compound in the sign of:
A. Saturation
B. Unsaturation
C. Subsitution
D. None
4 Benzene has a -------- structure
A. Pentagonal
B. Hexagonal
C. Heptagonal
D. Tetragonal
5 Hydrocarbon which is liquid at room temperature is
A. Pentane
B. Butane
C. Propane
D. Ethane
6 During the preparation of alkanes the hydrogenation of alkenes or alkynes the catalyst may be
A. H2SO4
B. Ni
C. Fe2O3
D. Al2O3
7 Which one of the following gases is used for artificial ripening of fruits ?
A. Ethane
B. Ethyne
C. Methane
D. Propane
8 Which one gives acidic reactions?
A. CH3----C≡C-------CH3
B. CH3-----CH2-----HC=CH----CH2
C. CH3----CH=CH2
D. CH3-----C≡CH
9 Zn + HCI are used in
A. Clemenson reduction
B. Wof kishner reduction
C. Kolb's electrolysis
D. Wutruz reaction
10 During nitration of benzene, the active nitrating agent is
A. NO3
B. NO2+
C. NO2-
D. HNO3
11 An alkynes having Carbon count of 20 is
A. gas
B. liquid
C. Solid
D. None
12 The difference between amount of heat actually released and that of calculated is called
A. Bonding energy
B. Activation energy
C. Resonance energy
D. Transition energy
13 Benzene reacts with ozone and gives
A. Glycerin
B. Glyoxal
C. Maleic anhydride
D. Benzoic acid
14 A six membered ring containing one double bond called
A. Cyclohexene
B. Cyclohexane
C. Cyclohexadiene
D. None
15 Hydrocarbons are organic compounds which contain elements such as
A. Hydrogen
B. Carbon
C. Hydrogen and carbon
D. Halogens
16 When an aqueous solution of potassium salt of monocarboxylic acid is subjected to electrolysis, corresponding alkane is formed. This reation is known as
A. Cannizaro reaction
B. Sabatier-secderens reaction
C. Alkylation
D. Kolbe's reaction
17 Physical properties of alkanes increase with increase of all physical constants except
A. Boiling points
B. Melting points
C. Density
D. Solubility
18 The method in which alkanes prepared by alkyle halides in the presence of palladium - charcoal is
A. Hydrolysis
B. Electrolysis
C. Hydrogenation
D. Hydrogenolysis
19 The empirical formula of benzene is determined by
A. IR spectra
B. U.V
C. Elemental analysis
D. NMR spectra
20 Which is the used as test for the presence of alkenes
A. Reaction of cold dilute alkaline KMnO4
B. Combustion
C. Polymerization
D. Catalytic hydrogenation
21 Vinyl acetylene combines with HCl to form:
A. Polyacetylene
B. Benzene
C. Chloroprene
D. Divinyl acetylene
22 The presence of a double bond in a compound is the sign of
A. Saturation
B. Unsaturation
C. Substitution
D. None of above
23 The compound prepared by a substitution reaction of benzene is
A. Acetophenone
B. Glyoxal
C. Cyclohexame
D. Hexabromo cyclohexane
24 Aromatic hydrocarbons are the derivatives of
A. Normal series of paraffins
B. Alkene
C. Benzene
D. Cyclohexane
25 Which of the following substances is used as an antiknock compound?
A. Tetraethyl lead
B. Lead tetrachloride
C. Lead acetate
D. Ethyle acetate
26 Paraffins are also called
A. Alkanes
B. Alkynes
C. Alkenes
D. None of these
27 Alkanes are generally not reactive towards acids, alkalis, oxidation or reuducing agents. They however undergo some reactions, which one is the reaction undergone by alkanes
A. Elemination
B. Addition
C. Free radical substitution
D. Nucleophilic substation
28 Odour of alkene is:
A. Fruity
B. Odourless
C. Zarlic like
D. Irritating
29 Ethylene can be prepared in the laboratory by heating together ethyl alcohol and
A. HCI
B. Phenol
C. HF
D. H2SO4
30 Which is liquid among the following alkenes?
A. Ethane
B. Propene
C. Butene
D. Pentene

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