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

Th IUPAC name of the compound having formula (CH3) 3 C - CH = CH2 is

Question # 2

Octane number is zero for

Question # 3

In CH4, all the H-C-H bond angles are

Question # 4

Substitution of halogen in the benzene ring requires catalyst

Question # 5

Cyclohexane can be converted not benzene in the presence of

Question # 6

Alkenes normally have ______ geometry

Question # 7

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

Question # 8

The reaction-method that does not give an alkane is

Question # 9

Nitroalkane are used in

Question # 10

Which is symmetric alkene?

Question # 11

Which gas is produced by treating CaC2with water

Question # 12

Kolb's method has limited synthetic applications due to

Question # 13

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 # 14

Alkenes combine readily with electrophillic reagents such as halogens giving

Question # 15

Which of the following is an ortho-para directing group

Question # 16

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

Question # 17

Hydrocarbons are organic compounds which contain elements such as

Question # 18

Which gas is used for welding purposes

Question # 19

Sulphuric acid generates nitronium ion by reacting with

Question # 20

the unreactivity of alkanes is based upon

Question # 21

Acetylene gives

Question # 22

Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively

Question # 23

Toluene is also called

Question # 24

The addition of HBr is easiest with

Question # 25

The carbon, carbon bond length in benzene is

Question # 26

Vinyl acetylene combines with HCI to form

Question # 27

Which one gives acidic reactions?

Question # 28

Alkyne is :

Question # 29

The sp2hybird orbitals are oriented in space at one angle

Question # 30

The hydrocarbons having double bonds normally end with suffix

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Sr.# Question Answer
1 Benzene is obtained by fractional distillation of
A. Heavy oil
B. Anthracene oil
C. Middle oil
D. Light oil
2 For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to
A. Hydrolysis
B. Oxidation
C. Hydrogenation
D. Electrolysis
3 The elimination of HX from adjacent carbon atoms is called
A. Halogenations
B. Hydrohalogenation
C. Dehydrohalogenation
D. Hydration
4 Alkanes containing carbon C18ownwards are
A. Gases
B. Liquids
C. Waxy solids
D. Solids
5 Benzene is obtained from benzene sulphonic acid by treating with
A. HCl
B. NaOH
C. H2O
D. NaHCO3
6 When acetylene is passed through a copper tube at 300°C, it polymerizes to
A. Polyacetylene
B. polyethylene
C. Benzene
D. None of these
7 During the preparation of alkynes the active metals that react with tetra halo-alkanes are
A. Zn
B. Mg
C. Both a and b
D. None
8 Which of the following substances is used as an antiknock compound?
A. Tetraethyl lead
B. Lead tetrachloride
C. Lead acetate
D. Ethyle acetate
9 Free radical mechanism of halogenation of alkanes follow step:
A. Initiation
B. Propagation
C. Termination
D. All of these
10 CnH2nis the general formula of
A. Alkanes
B. Alkanes
C. alkynes
D. None of above
11 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
12 Write the name of following compound
A. 5 - methyle - 2- hexene
B. 2 - methyle hexene
C. 4 - ethyle - 2 - methyle hexene
D. 3 - ethyle - 3 - methyl hexene
13 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
14 Aromatic hydrocarbons are the derivatives of
A. Normal series of paraffins
B. Alkene
C. Benzene
D. Cyclohexane
15 Vinyl acetylene combines with HCl to form:
A. Polyacetylene
B. Benzene
C. Chloroprene
D. Divinyl acetylene
16 Meta directing group decreased the ----------- of benzene ring
A. Physical activity
B. Chemical reactivity
C. Density
D. None
17 Eletronegativity difference in C-C bond in alkanes is:
A. Zero
B. Double
C. Half
D. 4.0
18 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
A. 100
B. 70
C. 50
D. 40
19 Which of the following decolorized Br2-water
A. Methane
B. Ethane
C. Ethene
D. Propane
20 Alkyl halides when reduced with nascent hydrogen in the presence of Zn + HCI, are converted to
A. Alkynes
B. Alkenes
C. Alkanes
D. Alcohol
21 The carbon, carbon bond length in benzene is
A. 1.54A°
B. 1.34A°
C. 1.20A°
D. 1.39A°
22 Mustard gas is a
A. Gas
B. High boiling speed
C. High melting liquid
D. Steam
23 Ethylene decolorizes cold dilute solution of KMnO4. This test is known as
A. Colouration test
B. Baeyer's test
C. Silver mirror test
D. Ring test
24 Which of the following is not aromatic hydrogencarbon
A. Benzene
B. Naphthalene
C. Toluene
D. Cyclohexene
25 Kolb's method of alkanes production, is actually
A. Hydrolysis
B. Catalysis
C. Electrolysis
D. Hydrogenation
26 Polymerization of ethane take place at pressure of 100 atm and a temperature of
A. 200°C
B. 400°C
C. 600°C
D. 800°C
27 The addition of HBr is easiest with
A. CH2 = CHCl
B. CICH = CHCl
C. CH3 - CH = CH2
D. (CH3)2 C = CH2
28 During nitration of benzene, the active nitrating agent is
A. NO3
B. NO2+
C. NO2-
D. HNO3
29 Which of the following is not an ortho-para directing group
30 The next homologue of C10H22will be
A. C9H20
B. C12H26
C. C11H24
D. C13H28

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