ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

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

Paraffins are also called

Question # 2

The benzene molecule contains

Question # 3

Free radical mechanism of halogenation of alkanes follow step:

Question # 4

The order of dehydration of alcohol

Question # 5

Synthetic rubber is made by polymerization of

Question # 6

Hybridization in alkanes is:

Question # 7

During the preparation of alkynes the active metals that react with tetra halo-alkanes are

Question # 8

When methane reacts with Cl2in the presence of diffused light the products obtained are?

Question # 9

De halogenatiion of tetrahalides happens in the presence of active metal like

Question # 10

Alkanes are least reactive towards:

Question # 11

An alkynes having Carbon count of 20 is

Question # 12

The term aromatic was derives from

Question # 13

Alkanes are soluble in all except

Question # 14

The elimination of HX from adjacent carbon atoms is called

Question # 15

The reaction-method that does not give an alkane is

Question # 16

The method involved for electrolysis of Na or K salts of carboxylic acids

Question # 17

C18and onward hydrocarbons are normally

Question # 18

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

Question # 19

Kolb's method is not useful for the production of

Question # 20

Alkynes are colourless & odouless except

Question # 21

The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule

Question # 22

Eletronegativity difference in C-C bond in alkanes is:

Question # 23

In which one of the following compound rings are not fused together at ortho positions

Question # 24

Preparation of ethylbenzene by the reaction of bromobenzene, ethylbromide and sodium is called

Question # 25

When alkyl is treated with chlorine in the presence of sunlight

Question # 26

The three alternate single and double bonds in the benzene ring are called

Question # 27

Preparation of vegetable ghee involves

Question # 28

Which of the following possesses the highest melting point?

Question # 29

An organic compound, on treatment with Br2 in CC14 gives bromoderivative of an alkene. The compound will be

Question # 30

The treatment of benzene with isobutene in the presence of sulphuric acid give

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Sr.# Question Answer
1 The simplest and the parent members of aromatic hydrocarbon is
A. Benzene
B. Toluene
C. Biphenyis
D. Naphthalene
2 "Each different compound should have a different name" was published by IUPAC system of nomenclature in
A. 1892
B. 1830
C. 1947
D. 1979
3 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
4 Vinyl acetylene combines with HCI to form
A. Poly acetylene
B. Benzene
C. Chloroprene
D. Divinylacetylene
5 To differentiate isomers we use
A. n-
B. iso-
C. neo
D. All of them
6 The process in which orbitals of different energies and shapes mix with each other to give equivalent hybrid orbitals is called
A. Isomerization
B. polymerization
C. Hybridization
D. Resonance
7 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
8 In which one of the following compound rings are not fused together at ortho positions
A. Phenanthrene
B. Naphthalene
C. Diphenyemethane
D. Anthracene
9 Catalytic oxidation of alkanes is used for the preparation of
A. Adehydes
B. Ketones
C. Fatty acid
D. Carbonyylic acids
10 The order of reactivity of halogen acids towards alkenes
A. HCl > HBr > Hl
B. HBr > HCl > HI
C. HCl > HBr
D. HI > HBr > HCl
11 Sulphuric acid generates nitronium ion by reacting with
A. Nitric acid
B. Nitrogen gas
C. Nitrous acid
D. Potassium nitrate
12 Hydrocarbon which is liquid at room temperature is
A. Pentane
B. Butane
C. Propane
D. Ethane
13 Which one of the following is (m-xylene)
A. 1,2 dimethyl benzene
B. 1,3 dimethyl benzene
C. 1,5 dimethyl benzene
D. 1,4 dimethyl benzene
14 Eletronegativity difference in C-C bond in alkanes is:
A. Zero
B. Double
C. Half
D. 4.0
15 Boiling point of n-butane is:
A. -102°C
B. -75°C
C. -55°C
D. 55°C
16 The stability of acromatic compounds decreases with ------- in the no. of its resonance structure
A. Decrease
B. Increase
C. Remain constant
D. Partially decreases
17 When methane reacts with Cl2in the presence of diffused light the products obtained are
A. Chloroform only
B. Carbon tetrachloride only
C. Chloromethane and dichloromethane
D. Mixture of a, b, c
18 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
19 The presence of a double bond in a compound is the sign of
A. Saturation
B. Unsaturation
C. Substitution
D. None of above
20 All are ortho & Para directing except
A. X
B. OH
C. NR3
D. NH2
21 Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?
A. Chlorination, nitration, reducing
B. Nitration, chlorination, reducition
C. Nitration, reduction,chlorination
D. Nitration, reduction, acylation, chlorination, hydrolysis
22 The sp2hybird orbitals are oriented in space at one angle
A. 180°
B. 109.5°
C. 100°
D. 120°
23 When methane reacts with Cl2in the presence of diffused light the products obtained are?
A. Chloroform only
B. Carbon tetrachloride only
C. Chloromethane and dichloromethane
D. Mixture of a,b,c
24 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
25 Paraffins are also called
A. Alkanes
B. Alkynes
C. Alkenes
D. None of these
26 Th IUPAC name of the compound having formula (CH3) 3 C - CH = CH2 is
A. 1, 1-Dimethyl-3-butene
B. 1,1,1-Trimethyl-3-propene
C. 3,3,-Dimenthyl-1-butene
D. 3,3,3,-Trimethyl-1-propene
27 Write the name of following alkene CH2= CH - CH = CH2
A. 1,3 butadiene
B. Butra -1, 3-diene
C. Both a & b
D. None
28 Benzene does not undergo
A. Substitution reaction
B. Addition reaction
C. Oxidation reaction
D. Elimination reaction
29 Alkanes containing carbon C18ownwards are
A. Gases
B. Liquids
C. Waxy solids
D. Solids
30 Odour of alkene is:
A. Fruity
B. Odourless
C. Zarlic like
D. Irritating

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