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 bond is most stable

Question # 2

An electrophile may be

Question # 3

1, 3-Dibromopropane reacts with metallic zinc to form

Question # 4

Alkanes may be prepared by the reaction of alkyl halides with

Question # 5

Carbon atom holding halogen in aryl halides is

Question # 6

The order of reactivity for a given halogen in Grignard's reagent is:

Question # 7

Ethyl chloride on treatment with aqueous alkali gives

Question # 8

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

Question # 9

When formaldehyde is added to Grignard reagent we get

Question # 10

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

Question # 11

Alkyl halides are reactive :

Question # 12

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

Question # 13

Elimination bimolecular reactions involve:

Question # 14

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

Question # 15

Alkyl halides on treatment with Zn and HCI gives

Question # 16

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

Question # 17

The rate of E1reaction depends upon:

Question # 18

Which of the following undergoes uncleophilic substitution exclusively by SN1 mechanism?

Question # 19

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

Question # 20

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

Question # 21

Which of the following is a nucleophile

Question # 22

Reaction of Griganard's reagent with CO2gives:

Question # 23

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

Question # 24

which one of the following is not a nucleophile?

Question # 25

Benzene hexachloride is used as

Question # 26

Reduction of alkyl halides give

Question # 27

What happens when CCl4is treated with AgNO3solution?

Question # 28

A set of compounds in which reactivity of halogen atom in the ascending order is

Question # 29

When carbon dioxide is passed through the R - Mg - X is produced

Question # 30

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

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ECAT Chemistry Chapter 21 Important MCQ's

Sr.# Question Answer
1 For the carbylamine reaction we need hot alc.KOH and
A. Any amin and chloroform
B. Chloroform and Ag powder
C. A primary amine and chloroform
D. A mono alkyl amine and trichlorom-ethane
2 Alkyl halides on treatment with Zn and HCI gives
A. Alkanes
B. Alkenes
C. Alkynes
D. Alcohols
3 Electronegativity order of alkyl halides is:
A. Rl > RBr > RCl > RF
B. Rbr > RCl > RF >Rl
C. RCl > RF >Rl > RBr
D. RF >Ri > RBr >RII
4 Grignard reagent is prepared by the reaction of magnesium metal with alkyl halide in the presence of
A. Alcohol
B. Water
C. Suephuric acid
D. Dry ether
5 The alkyl halide molecule on which a nucleophile attacks is called
A. Substrate
B. Subsituent
C. Substituted
D. All of these
6 Chlorobenzene on heating with aqueous NH3under pressure in the presence of cuprous chloride gives
A. Benzamide
B. Nitrobenzene
C. Aniline
D. Chloroaminobenzene
7 SN1 reaction of alkylhalides leads to
A. Retention of configuration
B. Recemisation
C. Inversion of configuration
D. None of these
8 Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent
A. A ketone
B. An aldehyde
C. An ether
D. Water
9 Halogens on treating with silver salts of acids give
A. Alcohol
B. Ester
C. Phenol
D. Alkyl halide
10 The reaction of alcohol with SOCI2in the presence of pyridine as catalyst gives
A. Acids
B. Acid chloride
C. Alkyl halide
D. Benzene

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