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

Which one of the following is not a nucleophile

Question # 2

Which of the following compounds on oxidation gives benzoic acid?

Question # 3

By simply reacting Grignand's reagent with water we get

Question # 4

which one of the following is not a nucleophile?

Question # 5

E2has molecularity :

Question # 6

SN2reactions can be best carried out with:

Question # 7

Hydrolysis of Grignard's reagent yields

Question # 8

Grignard reagent is reactive due to :

Question # 9

Alkyl halides on treatment with metallic Na give

Question # 10

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

Question # 11

Best medhod of preparation of alkyl halide from alcohals is by its reaction with:

Question # 12

Reaction of ethylamine with chloroform in alcoholic KOH produces

Question # 13

Grignad reagent is reactive due to

Question # 14

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

Question # 15

In a primary alkyl halide, the halogen atom is attached to a carbon which is further attached to

Question # 16

2-Bromopentane is heated with potassium ethoxide in ethanol . The major product obtained is

Question # 17

Which reaction is example of nucleophilic substitution

Question # 18

Reaction of Griganard's reagent with CO2gives:

Question # 19

If ketone reacts with Grignard's reagent, it also produces alcohol, But it will be a

Question # 20

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

Question # 21

Cl2reacts with CS2in presence of AlCl3to form

Question # 22

To get DDT, chlorobenzene has to react with one of the following compound in the presence of conc.H2SO4

Question # 23

Benzene hexachloride is used as

Question # 24

When CO2is made to react with ethyl magnesium iodide, followed by acid hydrolysis, the product formed is

Question # 25

Organic compounds containing halogen atom are called:

Question # 26

When alkyl halides are heated with aqueous solution of ammonia at about 100°C, amines are formed. This reaction is known as

Question # 27

Which of the following compounds could be prepared by reacting bromoethane with KCN and then reducing the product

Question # 28

Both E1and E2mechanism can be shown by

Question # 29

Unpleasant smell of carbylamine is obtained when chloroform and alcoholic KOH are heated with

Question # 30

SN2 reaction can be best carried out with

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ECAT Chemistry Chapter 21 Important MCQ's

Sr.# Question Answer
1 Reation of which with Grignard's reagent gives primary alcohol:
A. Formaldehyde
B. Aldehyde
C. Ketones
D. Acetone
2 Alkanes may be prepared by the reaction of alkyl halides with
A. Alcohol
B. Carboxylic acid
C. Grignard reagents
D. None of these
3 Reduction of alkyl halides give
A. Alkanes
B. Alkenes
C. Ketones
D. Ether
4 Chlorobenzene on heating with aqueous NH3under pressure in the presence of cuprous chloride gives
A. Benzamide
B. Nitrobenzene
C. Aniline
D. Chloroaminobenzene
5 How many monochlorobutanes will be possible on chlorination of n-butane?
A. 1
B. 2
C. 3
D. 5
6 E1mechanism is generally shown by
A. 1° - RX
B. 2° - RX
C. 3° - RX
D. None of these
7 When CO2is made to react with ethyl magnesium iodide, followed by acid hydrolysis, the product formed is
A. Propane
B. Propanoic acid
C. Propanal
D. Propanol
8 Reactivity of alkyl halides with magnisium is of the order:
A. Rl > RBr> RCl > RF
B. RBr > RCl >RF > Rl
C. RCL > RF > Rl > RBr
D. RF >RI >RBr > RII
9 The order of reactivity for a given halogen in Grignard's reagent is:
A. CH3X > C2H5X > C3H4X > C4H4X
B. C2H5X > C3H7X > C4H5X > CH4X
C. C3H7X > C4H7X > CH3X > C2H5X
D. C4H4X > C3H7X > C2H5X > CH4X
10 SN2 reaction has order of reaction :
A. First
B. Second
C. Third
D. Zero

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