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 of the following undergoes uncleophilic substitution exclusively by SN1 mechanism?

Question # 2

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

Question # 3

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

Question # 4

Alkyl halides react with lithium dialkyl copper reagents to give

Question # 5

When ethyl iodide and n-propyl iodide are allowed to react with sodium metal in ether, the number of alkanes that could be produced is

Question # 6

Which one of the following is not a nucleophile

Question # 7

Ethyl alcohol gives ethyl chloride with the help of

Question # 8

Which is a good nucleophile?

Question # 9

Grignard's reagent is

Question # 10

Alkyl halides in which a halogen atom is bonded to that carbon atom which directly bonded with one hydrogen atom is called

Question # 11

CFCs undergo homolytic fission by uv light in the stratosphere which radical could result from this irradiations of CHCICF2Cl.

Question # 12

Which one of the following in mainly responsible for depletion of ozone layer?

Question # 13

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

Question # 14

Benzene reacts with chlorine to form benzene hexachloride in presence of

Question # 15

Which of the followings is not a nulceophile

Question # 16

Which one of the following is not a nuclelphile

Question # 17

Halogens on treating with silver salts of acids give

Question # 18

The alkyl halide molecule on which a nucleophile attacks is called

Question # 19

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

Question # 20

Alkyle halides can be prepared by treating halogen acids with

Question # 21

SN1 reaction of alkylhalides leads to

Question # 22

Grignard reagent is not prepared in aqueous medium but prepared in ether medium because

Question # 23

Which of the following compounds on oxidation gives benzoic acid?

Question # 24

An electrophile may be

Question # 25

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

Question # 26

The reaction between primary amine-chloroform and alcoholic caustic potash is called

Question # 27

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

Question # 28

DDT is formed from

Question # 29

Grignard's reagent on treatment with carbonyl compounds yield

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 The reaction of alcohol with SOCI2in the presence of pyridine as catalyst gives
A. Acids
B. Acid chloride
C. Alkyl halide
D. Benzene
2 The reaction of 4-bromobenzyl chloride with NaCN in ethanol leads to
A. 4-Bromobenzyl cyanide
B. 4-Cyanobenzyl chloride
C. 4-Cyanobenzyle cyanide
D. 4-Bromo 2-cyanobenzyl chloride
3 Which of the following alkyl halides is used as a mathylating agent
A. CH2H5l
B. CH3l
C. C2H5Pr
D. C2H5Cl
4 Gammexane is
A. Chlorobenzene
B. Benzyl chloride
C. Brommobenzene
D. Benzene hexachloride
5 Alkyl halides on treatment with aqueous KOH give
A. Phenol
B. Alcohol
C. Aldehyde
D. Ketone
6 Which represents nucleophilic aromatic substitution reaction?
A. Reaction of benzene with Cl2in sunlight
B. Benzyl bromide hydrolysis with water
C. Reaction of NaOH with dintrofluoro benzene
D. Sulphonation of benzene
7 The reactivity order of alkyl halides for a particular alkyl group is:
A. F >Cl>Br>I
B. Cl>Br>F>l
C. l>Br>Cl>F
D. Br>l>Cl>F
8 Alkyl halides in which a halogen atom is bonded to that carbon atom which directly bonded with one hydrogen atom is called
A. Primary alkyl halides
B. Secondary alkyl halides
C. Tertiary alkyl halides
D. Quaternary alkyl halides
9 Which of the following undergoes uncleophilic substitution exclusively by SN1 mechanism?
A. Benzyl chloride
B. Ethyl chloride
C. Chlorobenzene
D. Isopropyl choride
10 Any other aldehyde except formaldehyde on reaction with Grignard's will produce
A. Secondary alcohol
B. Primary alcohol
C. Tertiary alcohol
D. Aromatic alcohol

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