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

When sodium benzoate is treated with soda lime (NaOH) benzene is formed. What is the other product

Question # 2

The sp2hybird orbitals are oriented in space at one angle

Question # 3

The geometry of acetylene is

Question # 4

Formula of chloroform is:

Question # 5

A fuel has the same knocking property as a mixture of 70 isooctane (2, 2, 4- trimethyl pentane) and 30% n-heptane by volume the octane number of the fuel is

Question # 6

Benzene is obtained by fractional distillation of

Question # 7

Aromatic hydrocarbons are the derivatives of

Question # 8

Which of the following decolorized Br2-water

Question # 9

Benzene has a -------- structure

Question # 10

Hydrocarbon which is liquid at room temperature is

Question # 11

Introduction of a second methyl group in methylbenzene will give how many isomeric dimethyllenzenes

Question # 12

Which is more active ?

Question # 13

The method used only for the production of symmetrical alkanes

Question # 14

C18and onward hydrocarbons are normally

Question # 15

Mustard gas is a :

Question # 16

What is not a common use of methane

Question # 17

Alkyl benzenes are readily oxidized by axidfied

Question # 18

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

Question # 19

The order of dehydration of alcohol

Question # 20

Which decolourizes the colour of Br3

Question # 21

Raney - nickel is the alloy of Ni with

Question # 22

Which is the used as test for the presence of alkenes

Question # 23

The hydrocarbon which is used as an illuminating agent

Question # 24

The four bonds of carbon in methane are directed towards the corners of

Question # 25

The major reaction occurring in the engines of automobiles is

Question # 26

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

Question # 27

Acetylene gives

Question # 28

The hydrocarbons having double bonds normally end with suffix

Question # 29

The reaction-method that does not give an alkane is

Question # 30

Ethylene can be prepared in the laboratory by heating together ethyl alcohol and

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Sr. # Question Answer
1 Which of the following decolorized Br2-water

A. Methane

B. Ethane

C.Ethene

D. Propane

2 Complete combustion of alkane yields

A. CO2+ H2O

B. CO2+ heat

C.CO + H2O heat

D. CO2+ H2O + heat

3 The stability of acromatic compounds decreases with ------- in the no. of its resonance structure

A. Decrease

B. Increase

C.Remain constant

D. Partially decreases

4 Toluene is also called

A. Hydroxyl benzene

B. Methyl benzene

C.ethyl benzene

D. None

5 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

6 The presence of a double bond in a compound in the sign of:

A. Saturation

B. Unsaturation

C.Subsitution

D. None

7 In Friedal-Craft's alkylation besides AlCl3 the other reactants are

A. C6H6 + NH3

B. C6H6 + NH4

C.C6H6 + CH3Cl

D. C6H6 + CH3COCl

8 The order of dehydration of alcohol

A. 10> 20> 30

B. 10> 30> 20

C.20> 30> 10

D. 30> 20> 10

9 Preparation of vegetable ghee involves:

A. Halogenation

B. Hydrogenation

C.Hydroxylation

D. Dehydrogenation

10 Substitution of halogen in the benzene ring requires catalyst

A. AlCl3

B. FeCl3

C.SiO2

D. Organo - nickel

11 Alkanes are gases :

A. C1-C4

B. C5-C10

C.C11-C15

D. C10-C20

12 An alkane is produced when an alkyle halide reacts with zinc in the presence of

A. HCl

B. CH3COOH

C.Both a & b

D. None

13 Which of the following is not aromatic hydrogencarbon

A. Benzene

B. Naphthalene

C.Toluene

D. Cyclohexene

14 Kolb's method is not useful for the production of

A. Methane

B. Ethane

C.Propane

D. Butane

15 Which of the following is not an electrophitic substitution reaction of benzene

A. Nitration

B. Sulphonation

C.Fridel-Craft alkylation

D. Free radical chlorination of benzene

16 The benzene molecule contains

A. Three double bonds

B. Two double bonds

C.One double bonds

D. Delocalizedπ-electron charge

17 Mustard gas is a :

A. Gas

B. Liquid

C.Solid

D. High boiling point

18 All are ortho & Para directing except

A. X

B. OH

C.NR3

D. NH2

19 Alkyne is :

A. CH3-CH3

B. CH4

C.CH2=CH2

D. C2H2

20 Synthesis rubber is made by polymerization :

A. Chloroform

B. Acetylene

C.Divinyl acetylene

D. Butene

21 Zn + HCI are used in

A. Clemenson reduction

B. Wof kishner reduction

C.Kolb's electrolysis

D. Wutruz reaction

22 The geometry of acetylene is

A. Angular

B. Bent

C.Trigonal

D. Linear

23 Meta directing group decreased the ----------- of benzene ring

A. Physical activity

B. Chemical reactivity

C.Density

D. None

24 Which is symmetric alkene?

A. CH=C-CH2

B. CH≡CH

C.CH3-C≡C - CH3

D. B and C

25 Eletronegativity difference in C-C bond in alkanes is:

A. Zero

B. Double

C.Half

D. 4.0

26 Which class of compound is more reactive

A. Alkane

B. Alkene

C.Alkyne

D. None

27 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

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

A. Conjugate bonds

B. Resonating bonds

C.Both A and B

D. None of above

29 The hydrocarbon which is used as an illuminating agent

A. Methane

B. Methene

C.Methyne

D. B & C

30 Odour of alkene is:

A. Fruity

B. Odourless

C.Zarlic like

D. Irritating

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