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Preparation and Properties of Monohalides - Free MCQ Practice Test


MCQ Practice Test & Solutions: Test: Preparation and Properties of Monohalides (20 Questions)

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Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 20

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Test: Preparation and Properties of Monohalides - Question 1

Which of the following pairs of compounds are enantiomers?

Detailed Solution: Question 1

Compound which are mirror image of each other and are non superimposable are termed as enantiomers.

These are enantiomers

Test: Preparation and Properties of Monohalides - Question 2

The correct order of SN2 E2 ration for the % yield of product of the following halide is

 

(R) CH3 — CH2 — I

Detailed Solution: Question 2

The correct answer is Option A
Least hindered halides give the fastest SN2 reaction as the hindrance increases. As the hindrance increases, the occurrence of SN2 reaction decreases.

Test: Preparation and Properties of Monohalides - Question 3

Among the following organic halides in the increasing order of their dehydrohalogenation reactions in the presence of alcoholic
(A) 
(B) 
(C) 
(D) 

Detailed Solution: Question 3

The elimination reaction (dehydrohalogenation)
is favoured by those substrates that form a more stable carbocation intermediate.
Thus, the order of reactivity will be :-

Test: Preparation and Properties of Monohalides - Question 4

Which one of the following is more reactive towards reaction?

Detailed Solution: Question 4

Bimolecular nucleophilic substitution reaction involves reaction between reactant and nucleophile simultaneously without the formation of carbocation. Less hindered species are more reactive towards reaction. As is least hindered alkyl halide, it will show more fast reaction towards reaction.

Test: Preparation and Properties of Monohalides - Question 5

Benzene reacts with -propyl chloride in the presence of anhydrous to give

Detailed Solution: Question 5

Test: Preparation and Properties of Monohalides - Question 6

What is the product of the following reaction ?

Detailed Solution: Question 6

Test: Preparation and Properties of Monohalides - Question 7

Identify and in the following reaction

Detailed Solution: Question 7

Ethyl chloride can be converted into ethyl alcohol either by using aqueous alkali or by moist .

Test: Preparation and Properties of Monohalides - Question 8

Consider the reactions
(i)
(ii)
The mechanism of reactions (i) & (ii) are respectively

Detailed Solution: Question 8

and
Since rearrangement do not occur in the given nucleophilic substitution reactions, therefore carbocations are not the intermediate in these reactions. Thus both the reactions occur by mechanism.

Test: Preparation and Properties of Monohalides - Question 9

How many stable alkenes on reaction with HCl will produce

Detailed Solution: Question 9

Test: Preparation and Properties of Monohalides - Question 10

Number of ambidentate nucleophiles among the following

Detailed Solution: Question 10

Test: Preparation and Properties of Monohalides - Question 11

Number of substrates which will show rearrangement is

Detailed Solution: Question 11

By analyzing each substrate, we find that substrates (I), (II), (IV), (VI), (VII), (VIII), and (IX) can all undergo rearrangement. So number of substates is 6.

Test: Preparation and Properties of Monohalides - Question 12


How many structures for are possible?

Detailed Solution: Question 12

Test: Preparation and Properties of Monohalides - Question 13

Which one of the following compounds most readily undrgoes substitution by mechanism?

Detailed Solution: Question 13

The increasing order of the nucleophilic substitution by mechanism is tert
alkyl halide sec alkyl halide primary alkyl halide.
Compound B is primary alkyl halide.
Hence it most readily undergoes substitution by mechanism.
Note: compound is also primary alkyl halide but in it, the carbon attached to is more hindered.

Test: Preparation and Properties of Monohalides - Question 14

Which of the following is fast debrominated?

Detailed Solution: Question 14

More the stabllity of tie product, faster is debromination of the parent compound.

Test: Preparation and Properties of Monohalides - Question 15

The organic compound (P) of the reaction:

is

Detailed Solution: Question 15

We must know that the Haloalkane in the presence of alcoholic undergoes elimination reactions. For example:

Alcoholic potassium hydroxide, solution that functions as solvent gives alkoxide ions that act as a strong base. This base abstracts -Hydrogen atom from saturated substrate - alkyl halide.
Abstracted -Hydrogen atom is then transferred to the alkyl part to form an alkane and simultaneously a molecule of is eliminated.
The basicity of hydroxide ions is considerably lower than the basicity of alkoxide ions. Hydroxide ion is significantly getting hydrated in aqueous solution. Hence, hydroxide ions cannot abstract -hydrogen atoms of alkyl chloride to eliminate and form alkene.

Test: Preparation and Properties of Monohalides - Question 16

Detailed Solution: Question 16

Test: Preparation and Properties of Monohalides - Question 17


Which statement is true for the above reaction?

Detailed Solution: Question 17

The correct option is B Inversion of configuration.

Here inversion of configuration occurs.

Test: Preparation and Properties of Monohalides - Question 18

On on heating diethyl ether with conc- HI, 2 moles of which of the following is formed

Detailed Solution: Question 18

Firstly the HI given will get ionized:

The iodide ion produced will attack one of the Carbon-oxygen bonds, gets attached to carbon, the hydrogen ion produced in the first step will get attached to a negatively charged oxygen atom:

The ethanol produced in the above step still has a carbon-oxygen bond and we are provided with an excess of HI (concentrated), so the iodide ion will now attack the carbon-oxygen bond of ethanol similarly, and the hydrogen ion will get attached to hydroxide ion produced:

Thus, the overall reaction between diethyl ether and hot and concentrated HI will be:

Means, the given reaction will give two moles of ethyl iodide.

Test: Preparation and Properties of Monohalides - Question 19

Alkyl halide reacts with an alcoholic solution of ammonia to give a mixture of:

Detailed Solution: Question 19

Acoholic solution of ammonia is heated in a sealed tube at 100

Test: Preparation and Properties of Monohalides - Question 20

Product-I Product-II The correct statement is

Detailed Solution: Question 20

(Product-I)
(Nucleophilic substitution reaction)
(Product-II)
(elimination reaction)
(Product-I) isomer is
denydration

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