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

Benzene is obtained from benzene sulphonic acid by treating with

Question # 2

The order of reactivity of halogen acids towards alkenes

Question # 3

acetylene can be converted into-while passing through a Cu-tube at 300°C:

Question # 4

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

Question # 5

Alkene general formula :

Question # 6

What is not a common use of methane

Question # 7

The alkynides are used for the ----------- of alkynes

Question # 8

A salt producing hydrocarbon among these compounds is

Question # 9

The difference between amount of heat actually released and that of calculated is called

Question # 10

Alkynes are colourless & odouless except

Question # 11

Hydrocarbons contain :

Question # 12

The carbon, carbon bond length in benzene is

Question # 13

The hydrocarbon which is used as an illuminating agent

Question # 14

Which is the used as test for the presence of alkenes

Question # 15

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

Question # 16

When n-hexane is heated in the presence of Pt at 500°C, it cyclists to give

Question # 17

Sp3hybird orbitals are oriented at an angle of

Question # 18

The hydrocarbons having double bonds normally end with suffix

Question # 19

Which can be used for dehydration of alcohol

Question # 20

Which gas is produced by treating CaC2with water

Question # 21

The order of reactivity of halogens in aliphatic substitution reactions is

Question # 22

Which reaction is too vigorous to control

Question # 23

Kolb's method has limited synthetic applications due to

Question # 24

Alkenes combine readily with electrophillic reagents such as halogens giving

Question # 25

When benzene is burnt in free supply of air, it is completely oxidized to

Question # 26

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

Question # 27

The molecule of ethane possess which hybrization

Question # 28

Benzene is prepared from n-hexane in the presence of catalyst

Question # 29

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

Question # 30

Alkyl halides when reduced with nascent hydrogen in the presence of Zn + HCI, are converted to

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Sr.# Question Answer
1 The carbon, carbon bond length in benzene is
A. 1.54A°
B. 1.34A°
C. 1.20A°
D. 1.39A°
2 When n-hexane is heated in the presence of Pt at 500°C, it cyclists to give
A. Benzene
B. Cyclohexene
C. Benzene
D. Toluene
3 Alkanes have functional group :
A. ----X
B. --OH
C. ----COH
D. No functional group
4 Benzene is not prepared from
A. Acetylene
B. Phenol
C. Benzoic acid
D. Bromo benzene
5 Which gas is used for welding purposes
A. Butane
B. Nitrogen
C. Methane
D. Acetylene
6 The temp. used for the hydrogenation of alkenes using Ni is
A. 2000°C
B. 400°C
C. 200-- 300°C
D. 1000°C
7 Which one of the following gases is used for artificial ripening of fruits
A. Ethane
B. Ethyne
C. Methane
D. Propane
8 How many molecules of chlorine adds in benzene in the presence of sunlight
A. One
B. Two
C. Three
D. Four
9 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
10 Benzene was discovered by Michael Faraday's in
A. 1824
B. 1825
C. 1826
D. 1827
11 Marsh gas was the name given to
A. Methane
B. Ethane
C. Propane
D. Butane
12 Benzene does not undergo polymerization and it is also resistant to
A. Reduction
B. Oxidation
C. Alkylation
D. Ozonolysis
13
Question Image
A. Pent -1-ene-3-yne
B. 2-pentyne-4-ene
C. 1-pentene-3-yne
D. Pent-2-yen-4-ene
14 CnH2nis the general formula of
A. Alkanes
B. Alkanes
C. alkynes
D. None of above
15 The term aromatic was derives from
A. Greek word
B. Latin
C. Russian
D. English
16 The benzene molecule contains
A. Three double bonds
B. Two double bonds
C. One double bonds
D. Delocalizedπ-electron charge
17 Preparation of vegetable ghee involves
A. Halogenations
B. Hydrogenation
C. Hydroxylation
D. Dehydrogenation
18 The treatment of benzene with isobutene in the presence of sulphuric acid give
A. isobutyl benzene
B. tert-Butyl benzene
C. n- Butyl benzene
D. no reaction
19 Hybridization in alkanes is:
A. sp
B. sp2
C. sp3
D. dsp2
20 Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively
A. Zinc dust and soda lime
B. Soda time and zinc dust
C. Zinc dust and sodium hydroxide
D. Soda lime and copper
21 De halogenatiion of tetrahalides happens in the presence of active metal like
A. Zn
B. Mg
C. Both a and b
D. None of them
22 How many isomeric disubtituted products are obtained by the introducing of second group in the ring
A. Two
B. Three
C. Four
D. None
23 Most common reactions of benzene and its derivatives are
A. electrophilic addition reactions
B. electrophilic substitution reactions
C. Nucleophilic addition reactions
D. Nucleophilic subtitution reactions
24 Cyclohexane can be converted not benzene in the presence of
A. Pt at 100°C
B. Pt at 250°C
C. Pd at room temperature
D. Pt at room temperature
25 A six membered ring containing one double bond called
A. Cyclohexene
B. Cyclohexane
C. Cyclohexadiene
D. None
26 Which of the following substances is used as an antiknock compound?
A. Tetraethyl lead
B. Lead tetrachloride
C. Lead acetate
D. Ethyle acetate
27 The electrophile in aromatic sulphonation is
A. H2SO4
B. HSO4
C. SO3
D. SO3+
28 Which gas is produced by treating CaC2with water
A. Methane
B. Ethane
C. Acetylene
D. HCI
29 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
30 Which one gives acidic reactions?
A. CH3----C≡C-------CH3
B. CH3-----CH2-----HC=CH----CH2
C. CH3----CH=CH2
D. CH3-----C≡CH

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