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

Action of Zn with alkyl halides in the presence of an inert solvent forms higher alkanes. This reaction is known as

Question # 2

By simply reacting Grignand's reagent with water we get

Question # 3

SN2reactions can be best carried out with:

Question # 4

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

Question # 5

Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent

Question # 6

Which of the following does not give iodoform test?

Question # 7

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

Question # 8

The reactivity order of alkyl halides for a paricular alkyl group is

Question # 9

Which represents nucleophilic aromatic substitution reaction?

Question # 10

What is the total number of different chloroethanes, formula C2H6-nCln, where n can be any integer from 1 to 4

Question # 11

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

Question # 12

Most reactive halide towards SN1 reaction is

Question # 13

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

Question # 14

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

Question # 15

Which of the following chlorocompounds is heat easily hydrolysed by hydorxide ion to give the product indicated

Question # 16

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

Question # 17

Elimination bimolecular reactions usually obey

Question # 18

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

Question # 19

SN1 reaction of alkylhalides leads to

Question # 20

Halogens on treating with silver salts of acids give

Question # 21

Which of the following is a nucleophile

Question # 22

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

Question # 23

Alkyl halides on treatment with metallic Na give

Question # 24

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

Question # 25

Reduction of alkyl halides give

Question # 26

Which bond is most stable

Question # 27

Grignard's reagent on treatment with chloramine give

Question # 28

Alkyl halides react with Mg in dry ether to form

Question # 29

Which one of the following will have the maximum dipole moment

Question # 30

A carbon atom carrying a postitive charge and attached to three other atoms of groups is called

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ECAT Chemistry Chapter 21 Important MCQ's

Sr.# Question Answer
1 The alkyl halide is converted into an alcohol by
A. Addition
B. Substitution
C. Dehydrohalogenation
D. Elimination
2 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
3
Question Image
A. Electrophilic addition
B. Electrophilic substitution
C. Free radical substitution
D. Nuclophilic addition
4 The reactivity order of alkyl halides for a paricular alkyl group is
A. Fluoride > chloride > bromide > iodide
B. Chloride > bromide > fluoride > iodide
C. Iodide > bromide > chloride > fluoride
D. Bromide > iodide > chloride > fluoride
5 Among the following the most reactive towards alcoholic KOH is
A. CH2= CHBr
B. CH3COCH2CH2Br
C. CH3CH2Br
D. CH3CH2CH2Br
6 Alkyl halides on treatment with Zn and HCI gives
A. Alkanes
B. Alkenes
C. Alkynes
D. Alcohols
7 Alkyl halides on treatment with metallic Na give
A. Alkynes
B. Alkenes
C. Alkanes
D. Alcohols
8 SN2 reaction has order of reaction :
A. First
B. Second
C. Third
D. Zero
9 Replacement of Cl of Chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-Dinitrochlorobenzene is readily replaced because
A. NO2makes the electron rich ring at ortho and para positions
B. NO2withdraws electrons at metaposition
C. NO2donate electrons at m-position
D. NO2withdraws electrons at ortho and para position
10 Alkyl halides react with Mg in dry ether to form
A. Magnesium halide
B. Grignard's reagent
C. Alkene
D. Alkyne

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