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

C18and onward hydrocarbons are normally

Question # 2

Benzene does not undergo

Question # 3

B-B'-dichloroethyl sulphide is commonly known as

Question # 4

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

Question # 5

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

Question # 6

Which can be used for dehydration of alcohol

Question # 7

CnH2nis the general formula of

Question # 8

Free radical mechanism of halogenation of alkanes follow step:

Question # 9

Alkynes are colourless & odouless except

Question # 10

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

Question # 11

Substituted phenyl groups are called

Question # 12

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

Question # 13

Benzene is obtained from benzene sulphonic acid by treating with

Question # 14

Which is the used as test for the presence of alkenes

Question # 15

The addition of HBr is easiest with

Question # 16

Which decolourizes the colour of Br3

Question # 17

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

Question # 18

The elimination of HX from adjacent carbon atoms is called

Question # 19

Cyclohexane can be converted not benzene in the presence of

Question # 20

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

Question # 21

Acetylene when treated with 10% H2SO4in the presence of HgSO4adds one molecule of water to form

Question # 22

Which one gives acidic reactions?

Question # 23

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

Question # 24

The order of reactivity of halogens in aliphatic substitution reactions is

Question # 25

The empirical formula of benzene is determined by

Question # 26

Preparation of ethylbenzene by the reaction of bromobenzene, ethylbromide and sodium is called

Question # 27

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

Question # 28

The electrophile in aromatic sulphonation is

Question # 29

Alkenes normally have ______ geometry

Question # 30

Which one of following is not monocyclic aromatic hydrocarbon

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Sr.# Question Answer
1 How many molecules of chlorine adds in benzene in the presence of sunlight
A. One
B. Two
C. Three
D. Four
2 Which reaction is too vigorous to control
A. Chlorination
B. Bromination
C. Iodination
D. Fluorination
3 The empirical formula of benzene is determined by
A. IR spectra
B. U.V
C. Elemental analysis
D. NMR spectra
4 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
5 The order of reactivity of halogens in aliphatic substitution reactions is
A. Br2 > C12 > F2
B. C12 > Br2 > F2
C. C12 C12 > Br2
D. F2 > Br2 > C12
6 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
7 Hydrocarbon which is liquid at room temperature is
A. Pentane
B. Butane
C. Propane
D. Ethane
8 The saturated hydrocarbons usually end with suffix ______
A. Ane
B. Ene
C. Yne
D. Oic
9 Benzene is obtained by fractional distillation of
A. Heavy oil
B. Anthracene oil
C. Middle oil
D. Light oil
10 An organic compound, on treatment with Br2 in CC14 gives bromoderivative of an alkene. The compound will be
A. CH3 - CH = Ch2
B. CH3CH = CHCH3
C. HC = CH
D. H2C = CH2
11 Alkenes combine readily with electrophillic reagents such as halogens giving
A. Haloalkanes
B. Gem-dihalides
C. Vicinal dihalides
D. Vinyl halides
12 Alkanes containing carbon C18ownwards are
A. Gases
B. Liquids
C. Waxy solids
D. Solids
13 Which compound was recognized the parent member of aromatic compounds
A. Aniline
B. Phenol
C. Benzene
D. Toluene
14 Hybridization of each carbon atom in benzene ring is
A. sp hybridized
B. sp2hybridized
C. sp3
D. dsp2
15 Aromatic hydrocarbons are the derivatives of
A. Normal series of paraffins
B. Alkene
C. Benzene
D. Cyclohexane
16 Acetylene is used in the manufacture of
A. Rubber
B. Plastic
C. Ethyle alcohol
D. All of these
17 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
18 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
19 Alkene general formula :
A. CnH2n+2
B. CnH2n
C. CnH2n-2
D. CnH2n+1
20 Benzene reacts with ozone and gives
A. Glycerin
B. Glyoxal
C. Maleic anhydride
D. Benzoic acid
21 The hydrocarbons having double bonds normally end with suffix
A. Ane
B. Ene
C. Yne
D. Oic
22 A single benzene ring can have ______ ortho position maximally
A. One
B. Two
C. Three
D. Four
23 Physical properties of alkanes increase with increase of all physical constants except
A. Boiling points
B. Melting points
C. Density
D. Solubility
24 The method in which alkanes prepared by alkyle halides in the presence of palladium - charcoal is
A. Hydrolysis
B. Electrolysis
C. Hydrogenation
D. Hydrogenolysis
25 Replacement of hydrogen by NO2group is called
A. Sulphonatioin
B. Hydration
C. Nitration
D. Cracking
26 Catalytic oxidation of alkanes is used for the preparation of
A. Adehydes
B. Ketones
C. Fatty acid
D. Carbonyylic acids
27 Which is the used as test for the presence of alkenes
A. Reaction of cold dilute alkaline KMnO4
B. Combustion
C. Polymerization
D. Catalytic hydrogenation
28 The geometry of acetylene is
A. Angular
B. Bent
C. Trigonal
D. Linear
29 CnH2nis the general formula of
A. Alkanes
B. Alkanes
C. alkynes
D. None of above
30 The stability of acromatic compounds decreases with ------- in the no. of its resonance structure
A. Decrease
B. Increase
C. Remain constant
D. Partially decreases

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