ECAT Pre Engineering Chemistry Chapter 20 MCQ Test With Answer

Question # 1

Kekule structures contributed towards actual structure of benzene

60% A
70% B
80% C
90% D

Question # 2

Aromatic hydrocarbons are the derivatives of:

Normal series of parrafins A
Alkene B
Benzene C
Cyclohexane D

Question # 3

Aroma meas:

Fragrant A
Invisible B
latest affinityt C
benzene D

Question # 4

empirical formula mass of benzene is time lesser than moleculer formula mass:

four A
five B
six C
seven D

Question # 5

The hydridization in benzene is

sp³ A
sp² B
sp⁴ C
dsp² D

Question # 6

Which term was derived from atomos?

atom A
hydrocarbon B
aromatic C
aliphatic D

Question # 7

Benzene gives reactions generally:

Electropholic subsitution A
addition B
synthesis C
addition and electropholic subsitution D

Question # 8

Benzene was discovered by first of all

Michael Faraday A
Hofmann B
Ainderson C
Sorenbon D

Question # 9

The benzene molecule contains:

Three double bond A
Two double bond B
One double bond C
DelocalizedᏘ electron charge D

Question # 10

Which of the following acid can be used as a catalyst in Friedel craft's reaction

AlCl³ A
HNO₃ B
BeCl₂ C
NaCl D

Question # 11

During nitration of benzene, the active nitrating agent is:

NO₃^-1 A
NO₂₊ B
NO₂^-1 C
HNO₃ D

Question # 12

Amongst the following, the compound that can be most readily sulphonated is

toluene A
benzene B
nitrobenzene C
chlorobenzene D

Question # 13

Amongst the following, the compound that can be most readily sulphonated is:

Toluene A
Benzene B
nitrobenzene C
chlorobenzene D

Question # 14

The electrophile in aromatic sulphontion is:

H₂SO₄ A
HSO₄ B
SO₃ C
SO₃₊ D

Question # 15

The electrophile in aromatic sulphonation Is

H₂SO₄ A
HSO₄^- B
SO₃ C
SO₃⁺ D

Question # 16

Monosubstituted benzene can have disubstitution at position:

Ortho A
meta B
para C
a, b, c D

Question # 17

Aromatic compounds burn with sooty flame cause

They have high percentage of hydrogen A
They have a ring structure B
They have high percentage of carbon C
They resist reaction with air D

Question # 18

Which compound is the most reactive one?

benzene A
ethene B
ethane C
ethyne D

Question # 19

Benzene reacts with Cl, in sunlight to give the end product

C₆H₆Cl₆ A
C₆H₆Cl B
O - C₆H₄Cl₂ C
P-C₆H₄Cl₂ D

Question # 20

Which term was derived from "aroma":

Atom A
Hydrocarbons B
aromatic C
aliphatic D

Question # 21

Acyiation of benzene to produce aliphatic aromatic ketones is known as

Friedel Craft's reaction A
benzenecondensation B
hydroformylation C
Clemmensen reduction
D

Question # 22

Benzoic acid can be prepared from the oxidation of

benzene A
ethyl benzene B
benzoic acid C
toluene D

Question # 23

Ratio of carbon to hydrogen in aromatic compounds is:

Low than alkanes A
High than alkanes B
Low than alkanes not high than alkanes C
High than alkanes D

Question # 24

Benzene was discovered by first of all:

Micheal Faraday A
Hofmann B
Ainderson C
Sorenbon D

Question # 25

_{Which compound is the most reactvie one:}

benzene A
ethene B
ethane C
ethyne D

Question # 26

Ozonolysis of benzene gives:

Nitration A
sulphonation B
ozonide C
glyoxal D

Question # 27

Benzene acid can be prepared from the oxidation of:

benzene A
ethyl benzene B
benzonic acid C
toluene D

Question # 28

Which of the following is explosive?

Trinitrophenol A
Nitrophenol B
Nitromethane C
Nitrobenzene D

Question # 29

The conversion of n-hexane into benzene by heating in the presence of CO, is called

lsomerization A
Aromatization B
Dealkylation C
Rearrangement D

Question # 30

Which is the property of benzene?

decolourizes KMnO₄ A
straight chain structure B
only double bond is present C
triple and double bond D

Sr.#	Question	Answer
1	Benzene reacts with Cl, in sunlight to give the end product	A. C₆H₆Cl₆ B. C₆H₆Cl C. O - C₆H₄Cl₂ D. P-C₆H₄Cl₂
2	Ozonolysis of benzene gives	A. nitration B. sulphonation C. ozonide D. glyoxal
3	Ratio of carbon to hydrogen in aromatic compounds is	A. Low than alkanes B. High than alkanes C. Low than alkenes not high than alkanes D. High than high than alkenes
4	Acylation of benzene to produce aliphatic aromatic ketones is known as:	A. Friedel Craft's reaction B. Benzene condensation C. Hydroformylation D. Cellemense
5	Acyiation of benzene to produce aliphatic aromatic ketones is known as	A. Friedel Craft's reaction B. benzenecondensation C. hydroformylation D. Clemmensen reduction
6	The conversion of n-hexane into benzene by heating in the presence of CO, is called	A. lsomerization B. Aromatization C. Dealkylation D. Rearrangement
7	Benzoic acid can be prepared from the oxidation of	A. benzene B. ethyl benzene C. benzoic acid D. toluene
8	The electrophile in aromatic sulphonation Is	A. H₂SO₄ B. HSO₄^- C. SO₃ D. SO₃⁺
9	Aromatic hydrocarbons are the derivatives of:	A. Normal series of parrafins B. Alkene C. Benzene D. Cyclohexane
10	Benzene was discovered by first of all:	A. Micheal Faraday B. Hofmann C. Ainderson D. Sorenbon

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