ECAT Pre Engineering Chemistry Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 21 Alkyl Halides

Try The MCQ's Test For ECAT Chemistry Chapter 21 Alkyl Halides

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ECAT Chemistry Chapter 21 Alkyl Halides

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Question # 1

Ethyl bromide is formed by the reaction of HBr with

Question # 2

SN2reactions can be best carried out with:

Question # 3

Grignard's reagent on treatment with chloramine give

Question # 4

Which one of the following is not a nuclelphile

Question # 5

When alkyl halide is heated with aqueous solution of ammonia at 100°C the major product is

Question # 6

The order of reactivity of an alkyl halide (R-X) for a particular alkyl group is

Question # 7

Electronegativity order of alkyl halides is:

Question # 8

SN2 reaction has order of reaction :

Question # 9

What is the total number of different chloroethanes of formula C2H6-nClnpossible (n may be 1 to 6)

Question # 10

Which of the following reacts with chloroform and base to form phenyl isocynaide?

Question # 11

In primary alkyl halides, the halogen atom is attached to a carbon which attached to how many carbon atoms?

Question # 12

By reaction Grignard's reagent with the HCHO we get

Question # 13

For which mechanisms, the first step involved is the same:

Question # 14

Which halide among the following is used as methylating agent?

Question # 15

What happens when CCl4is treated with AgNO3solution?

Question # 16

Grignard's reagent on treatment with dry CO2and HCI yields

Question # 17

Replacement of Cl of Chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-Dinitrochlorobenzene is readily replaced because

Question # 18

which one of the following is not a nucleophile?

Question # 19

The reaction of 4-bromobenzyl chloride with NaCN in ethanol leads to

Question # 20

DDT is formed from

Question # 21

Aryl halides are less reactive towards nucleophilic substitution reactions as compared to alkyl halides due to

Question # 22

An electrophile may be

Question # 23

Alkyl halides are considered to be very reactive compounds towards nucleophiles, because:

Question # 24

Thre rate of SN2 reaction depends upon the

Question # 25

Grignard reagent is prepared by the reaction of magnesium metal with alkyl halide in the presence of

Question # 26

Alkyl halides on treatment with metallic Na give

Question # 27

If carbon dioxide is bubbled through solution of Grignard's reagent in ether and the resultant product is reacted with hydrochloric acid, it gives

Question # 28

Alkyl halides on treatment with aqueous KOH give

Question # 29

Which of the following is a nucleophile

Question # 30

Each of the following compounds is effective as a refrigerant. The release of which one of these causes the greatest depletion of the ozone layer

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ECAT Chemistry Chapter 21 Important MCQ's

Sr.# Question Answer
1 Alkyl halides ae considered to be very reactive compounds towards nucleophiles because
A. They have an electrophilic carbon
B. They have an electrophilic carbon and a good leaving group
C. They have an electrophilic carbon and a bad leaving group
D. They have a nucleophilic carbon and a good leaving group
2 Steps in SN , reactions are:
A. One
B. Two
C. Three
D. Four
3 On warming with silver powder,chloroform is converted into
A. Acetylene
B. Hexachloroethane
C. 1,1,2,2-tetrachloroethane
D. ethylene
4 The rate of E1reaction depends upon
A. The concentration of substrate
B. The concentration of nucleophile
C. THe concentration of substrate as well as nucleophile
D. None of the above
5 The order of reactivity of an alkyl halide (R-X) for a particular alkyl group is
A. Iodide > bromide > chloride
B. Chloride > bromide > iodide
C. Bromide > chloride > iodide
D. Bromide > iodide > chloride
6 SN2 reaction has order of reaction :
A. First
B. Second
C. Third
D. Zero
7 Alkyl halides on treatment with Zn and HCI gives
A. Alkanes
B. Alkenes
C. Alkynes
D. Alcohols
8 For which mechanisms, the first step involved is the same:
A. E1 and E2
B. E2and SN2
C. E2 and E1
D. E1 and SN1
9 Which is a weak nucleophile
A. OH-
B. Br-
C. NH3
D. CI-
10 Reaction of ethylamine with chloroform in alcoholic KOH produces
A. CH3OH
B. CH3NC
C. C2H5NC
D. C2H5CN

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