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

Question # 2

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

Question # 3

Substitution of halogen in the benzene ring requires catalyst

Question # 4

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

Question # 5

Benzene reacts with ozone and gives

Question # 6

Synthetic rubber is made by polymerization of

Question # 7

Which of the following substances is used as an antiknock compound?

Question # 8

Alkynes are colourless & odouless except

Question # 9

Which one of the following gases is used for artificial ripening of fruits

Question # 10

Polymerization of ethane take place at pressure of 100 atm and a temperature of

Question # 11

Paraffins are also called

Question # 12

Alkenes normally have ______ geometry

Question # 13

Reaction of ethanes with KMnO4 gives:

Question # 14

The method in which alkanes prepared by alkyle halides in the presence of palladium - charcoal is

Question # 15

During the preparation of alkanes the hydrogenation of alkenes or alkynes the catalyst may be

Question # 16

Benzene is obtained from benzene sulphonic acid by treating with

Question # 17

Hybridization in alkanes is:

Question # 18

Preparation of vegetable ghee involves

Question # 19

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

Question # 20

Eletronegativity difference in C-C bond in alkanes is:

Question # 21

How many isomeric disubtituted products are obtained by the introducing of second group in the ring

Question # 22

Which of the following possesses the highest melting point?

Question # 23

Alkanes have functional group :

Question # 24

Hydrocarbons contain :

Question # 25

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

Question # 26

Which one does not declourized KMnO4

Question # 27

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

Question # 28

Which of the following species participate in sulphonation of benzene ring?

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

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

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Sr.# Question Answer
1 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
2 The benzene molecule contains
A. Three double bonds
B. Two double bonds
C. One double bonds
D. Delocalizedπ-electron charge
3 Benzene is prepared from n-hexane in the presence of catalyst
A. Cr2O3
B. Al2O3
C. SiO2
D. All above
4 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
5 Alkanes containing carbon C18ownwards are
A. Gases
B. Liquids
C. Waxy solids
D. Solids
6 Which one of the following gases is used for artificial ripening of fruits
A. Ethane
B. Ethyne
C. Methane
D. Propane
7 Which can be used for dehydration of alcohol
A. P4O10
B. H2SO4
C. H3PO4
D. All of them
8 Incomplete oxidation of alkanes yields
A. CO2& carbon black
B. CO2+ heat
C. CO and carbon black
D. CO + heat
9 The C-C bond angles in benzene ring are
A. 119°
B. 120°
C. 121°
D. None
10
Question Image
A. 2-bromonitrobenzene
B. 2-nitrobromobenzene
C. 1-bromonitrobenzene
D. 1-nitrobromobenzene
11 Which of the following species participate in sulphonation of benzene ring?
A. H2SO4
B. HSO4
C. SO3
D. SO-2
12 Which of the following is not aromatic hydrogencarbon
A. Benzene
B. Naphthalene
C. Toluene
D. Cyclohexene
13 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
14 Formula of chloroform is
A. CH3CI
B. CCI4
C. CH2CI2
D. CHCI3
15 Octane number can be changed by
A. Isomerisation
B. Alkylation
C. Cyclisation
D. All of these
16 Physical properties of alkanes increase with increase of all physical constants except
A. Boiling points
B. Melting points
C. Density
D. Solubility
17 How many molecules of chlorine adds in benzene in the presence of sunlight
A. One
B. Two
C. Three
D. Four
18 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
19 Hydrogenation of alkenes/alkynes inthe presence of Ni as catalyst at 3000°C result in the formation of corresponding alkanes. This reaction is known as
A. Sabatier-senderens reaction
B. kolbes reaction
C. Cannizaro's reaction
D. Haloform reaction
20 Which is symmetric alkene?
A. CH=C-CH2
B. CH≡CH
C. CH3-C≡C - CH3
D. B and C
21 The correct order of reactivity of halogens with alkanes is
A. l2> Br2> Cl2> F2
B. l2> Cl2> F2> Br2
C. F2> Cl2> l2> Br2
D. F2> Cl2> Br2> l2
22 Sulphuric acid generates nitronium ion by reacting with
A. Nitric acid
B. Nitrogen gas
C. Nitrous acid
D. Potassium nitrate
23 All are ortho & Para directing except
A. X
B. OH
C. NR3
D. NH2
24 The stability of acromatic compounds decreases with ------- in the no. of its resonance structure
A. Decrease
B. Increase
C. Remain constant
D. Partially decreases
25 Alkyne is :
A. CH3-CH3
B. CH4
C. CH2=CH2
D. C2H2
26 Meta directing group decreased the ----------- of benzene ring
A. Physical activity
B. Chemical reactivity
C. Density
D. None
27 The molecule of ethane possess which hybrization
A. sp3
B. sp2
C. sp
D. sp2d
28
Question Image
A. Pent -1-ene-3-yne
B. 2-pentyne-4-ene
C. 1-pentene-3-yne
D. Pent-2-yen-4-ene
29 Sp3hybird orbitals are oriented at an angle of
A. 107.5°
B. 108.5°
C. 109.5°
D. 103.5°
30 A six membered ring containing one double bond called
A. Cyclohexene
B. Cyclohexane
C. Cyclohexadiene
D. None

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