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Test: Physical & General Properties of Alkyl Halides - NEET MCQ


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22 Questions MCQ Test Topic-wise MCQ Tests for NEET - Test: Physical & General Properties of Alkyl Halides

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Test: Physical & General Properties of Alkyl Halides - Question 1

Only One Option Correct Type

Direction (Q. Nos. 1-9) This section contains 9 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Q. 

What is the major product of the reaction?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 1

Test: Physical & General Properties of Alkyl Halides - Question 2

Which are the products of the following sequence of reaction?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 2

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Test: Physical & General Properties of Alkyl Halides - Question 3

What is the product of the reaction shown?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 3


Test: Physical & General Properties of Alkyl Halides - Question 4

What set of reagents can be used to make octane from butyl chloride?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 4


Test: Physical & General Properties of Alkyl Halides - Question 5

Which of the following synthesis give 3-methyl-1 -hexanol?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 5

Test: Physical & General Properties of Alkyl Halides - Question 6

Q. 

What is the product in the above reaction?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 6

Test: Physical & General Properties of Alkyl Halides - Question 7

Chlorinated hydrocarbon

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 7

All of these are true regarding chlorinated hydrocarbons.

Test: Physical & General Properties of Alkyl Halides - Question 8

Which of the following alkyl halides cannot be converted into Grignard reagents?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 8

Halides contain ing acidic hydrogen (here — OH) cannot be used in Grignard's synthesis as Grignard reagent consist of very basic carbanion (R-).

Test: Physical & General Properties of Alkyl Halides - Question 9

Which one is liquid at room temperature?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 9

All others are gas at room temperature.

*Multiple options can be correct
Test: Physical & General Properties of Alkyl Halides - Question 10

One or More than One Options Correct Type

Direction (Q. Nos. 10-14) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q. 

1-chlorobutane can be reduced to butane by

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 10

1 -chlorobutane is a primary halide, LiAIH4, Zn, (C6 H5)3SnH all reduces it to butane but NaBH4 does not reduce primary halide.

*Multiple options can be correct
Test: Physical & General Properties of Alkyl Halides - Question 11

Tertiary butyl chloride can be reduced to 2-methyl propane by

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 11

LiAIH4 fails to reduce tertiary halide, rather elimination reaction takes place giving alkene.

*Multiple options can be correct
Test: Physical & General Properties of Alkyl Halides - Question 12

Which of the following float over water?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 12

Chloro and fluoro alkanes are less dense than water while bromo and iodoalkane are more denser than water.

*Multiple options can be correct
Test: Physical & General Properties of Alkyl Halides - Question 13

Which of the following halides are not suitable for Grignard’s synthesis?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 13

Both contain acidic hydrogen, not suitable for preparation of Grignard reagent.

*Multiple options can be correct
Test: Physical & General Properties of Alkyl Halides - Question 14

What is the expected product in the following reaction?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 14

Cyclic brom onium ion formed in the first step un dergo nucleophilic attack by both Br- and Cl- ions, giving both option (b) and option (c).

Test: Physical & General Properties of Alkyl Halides - Question 15

Comprehension Type

Direction (Q. Nos. 15-17) This section contains a paragraph, describing theory, experiments, data, etc. Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

In alkyl halides C—X bond is polar. Polarity of C—X bond is responsible for several characteristic reactions of alkyl halides viz.

R—X + H- (from metal hydride) → R —H + X-


Q. 

Which of the following will most easily be reduced by LiAIH4?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 15

As shown in mechanism, reduction occur by hydride transfer (SN2) mechanism. Hence, primary halide would be most reactive here.

Test: Physical & General Properties of Alkyl Halides - Question 16

Passage

In alkyl halides C—X bond is polar. Polarity of C—X bond is responsible for several characteristic reactions of alkyl halides viz.

R—X + H- (from metal hydride) → R —H + X-


Q. 

Which forms Grignard’s reagent with maximum difficulty?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 16
  • 1-Chloro-2,2-dimethylbutane (option d): This compound has a tertiary butyl group attached to the carbon adjacent to the halide. The steric hindrance due to the bulky groups would make it difficult for magnesium to approach and react with the halide. This increased steric hindrance would hinder the formation of the Grignard reagent.

  • 2-Chloro-2-methylbutane (option c): This is a secondary alkyl halide with some steric hindrance due to the methyl group but not as much as in option (c).

Test: Physical & General Properties of Alkyl Halides - Question 17

Passage

In alkyl halides C—X bond is polar. Polarity of C—X bond is responsible for several characteristic reactions of alkyl halides viz.

R—X + H- (from metal hydride) → R —H + X-


Q. 

Which of the following required more than one type of alkyl halides for its preparation by Wurtz’s reaction?

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 17

If two similar alkyl halides join by Wurtz’s reaction alkane containing even number of carbons are obtained. If mixed alkyl halides with one containing even and other containing odd number of carbons are used, alkane with odd number of carbons are obtained.

*Answer can only contain numeric values
Test: Physical & General Properties of Alkyl Halides - Question 18

One Integer Value Correct Type

Direction (Q. Nos. 18-20) This section contains 3 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q. 

Consider the following reactions,

 

Q. 

How many different diols are formed?


Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 18

*Answer can only contain numeric values
Test: Physical & General Properties of Alkyl Halides - Question 19

Dichloroalkanes with appropriate skeleton, on refluxing with Na in diethyi ether undergo cyclisation via Wurtz’s reaction. How many different isomeric dibromoalkanes on refluxing with Na metal in diethyl ether can give the same 1,4-dimethyl cyclohexane?


Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 19


Both of the above dichloride on heating with aikali metal gives the same 1,4-dimethyl cyclohexane.

*Answer can only contain numeric values
Test: Physical & General Properties of Alkyl Halides - Question 20

How many of the following are denser than water?
i. CCl
ii. CH3CH2CH2CH2CI
iii. Bromocyclohexane
iv. Chlorocyclopentane
v. 1 ,3-difiuorocyclopentane
vi. CH3I
vii. 1-fluorodecane
viti. CH2Br2
ix. CH3CI
X. CHCl3


Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 20

Only (ii), (iv), (vii) and (ix) are less dense than water. Alkyl bromides, alkyl iodides and all alkyl halides containing two or more halogen atoms.

Test: Physical & General Properties of Alkyl Halides - Question 21

Statement Type

Direction (Q. Nos. 21 and 22) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Q. 

Statement I : CH3F is less polar than CH3CI.

Statement II : F has greater electronegativity than Cl.

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 21

Although F is more electronegative than Cl, CH3F, is less polar. Dipole moment (μ) is defined as
μ = q.d
Due to smaller radius of F than Cl, q .d in CH3CI is greater than in CH3F although q is greater in CH3F.

Test: Physical & General Properties of Alkyl Halides - Question 22

Statement I : A tertiary halide (R3CX) is very less likely to form Grignard’s reagent with Mg in THF.

Statement II : Tertiary carbanion are highly unstable, very less likely to be formed.

Detailed Solution for Test: Physical & General Properties of Alkyl Halides - Question 22

Tertiary carbanion is very unstable, difficult to form.

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