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

Cl2reacts with CS2in presence of AlCl3to form

Question # 2

When an alcohol reacts with SOCI2an alkyl halide is formed. What are two other products

Question # 3

Catalyst in the reaction ROH + SOCl2-------> RCL+SO2+HCl is:

Question # 4

Reactivity of alkyl halides with magnisium is of the order:

Question # 5

Alkyl halides ae considered to be very reactive compounds towards nucleophiles because

Question # 6

1-Chlorobutane on reaction with alcoholic potash gives

Question # 7

SN1 reaction of alkylhalides leads to

Question # 8

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

Question # 9

Any other aldehyde except formaldehyde on reaction with Grignard's will produce

Question # 10

Benzene hexachloride is used as

Question # 11

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

Question # 12

Which reaction is example of nucleophilic substitution

Question # 13

The compounds or species in search of electrons are called

Question # 14

Dehydrohalogenation of alkyl halides give

Question # 15

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

Question # 16

Organic compounds containing halogen atom are called:

Question # 17

Alkyle magnesium halides are known as

Question # 18

Metal used in the preparation of Grignard's reagent is:

Question # 19

The reaction of an alkyl halide with RCOOAg produces

Question # 20

By reaction Grignard's reagent with the HCHO we get

Question # 21

What happens when CCl4is treated with AgNO3solution?

Question # 22

The final product formed by distilling ethyl alcohol with excess of Cl2 and Ca(OH)2is

Question # 23

Which of the following with aqueous KOH will give acetaldehyde?

Question # 24

Ethyl alcohol gives ethyl chloride with the help of

Question # 25

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

Question # 26

Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because of

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

Allyl chloride on dehydrochlorination gives

Question # 29

If Grignard reagent is allowed to react with another alkyl halide the main product is

Question # 30

Alcohol can be prepared from Grignard's reagent with an aldehyde: If we start with formaldehyde the product alcohol with be

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ECAT Chemistry Chapter 21 Important MCQ's

Sr.# Question Answer
1 Alkyl halides on treatment with metallic Na give
A. Alkynes
B. Alkenes
C. Alkanes
D. Alcohols
2 SN2 reaction has order of reaction :
A. First
B. Second
C. Third
D. Zero
3 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
4 Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because of
A. Onsolubility
B. Instability
C. Inductive effect
D. Steric hindrance
5 which one of the following is not a nucleophile?
A. H2O
B. H2S
C. BF3
D. NH3
6 Reaction of ethylamine with chloroform in alcoholic KOH produces
A. CH3OH
B. CH3NC
C. C2H5NC
D. C2H5CN
7 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
8 Ethyl alcohol gives ethyl chloride with the help of
A. SOCl2
B. NaCl
C. Cl2
D. KCl
9 When formaldehyde is added to Grignard reagent we get
A. Aldehyde
B. Acetone
C. Primary alcohol
D. Secondary alcohol
10 2-Bromopentane is heated with potassium ethoxide in ethanol . The major product obtained is
A. 2-Ethoxypentane
B. Pent-1-ene
C. cis-Pent-2-ene
D. trans-Pent-2-ene

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