Haloalkanes and Haloarenes Test

Result

Haloalkanes and Haloarenes Test - 79

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Weekly Quiz Competition

Question 1
1 / -0

Structural isomerism and stereoisomerism should be considered when answering this question.
$$2$$-bromopentane is heated with an excess of ethanolic sodium hydroxide. How many different hydrocarbons are produced?

A
$$1$$

B
$$2$$

C
$$3$$

D
$$4$$

Solution

$$CH_3-\overset{\overset{Br}{|}}CH-CH_2-CH_2-CH_3\xrightarrow{alc.NaOH}\underset{\text{Cis and trans}}{CH_3-CH=CH-CH_2-CH_3}+CH_2=CH-CH_2-CH_2-CH_3$$
It is $$\beta$$-elimination reaction. In this reaction one of the product is present in cis and trans form.

Thus we get 3 product.
Question 2
1 / -0

Which reagent cannot be used to prepare an alkyl halide from alcohol?

A
$$ NaCl $$

B
$$ PCl_5 $$

C
$$ SOCl_2 $$

D
$$ ZnCl_2 +HCl $$

Solution
Question 3
1 / -0

Which of the following alkyl halide is hydrolysed by $$S_N^1 $$ mechanism?

A
$$ (CH_3)_3CX $$

B
$$ CH_3CH_2X $$

C
$$ CH_3CH_2CH_2X $$

D
$$ (CH_3)_2CHX $$

Solution
Question 4
1 / -0

Which of the following alkyl halides is hydrolysed by $$ S_N 1 $$ mechanism?

A
$$ CH_3 Cl $$

B
$$ CH_3 CH_2 Cl $$

C
$$ CH_3 CH_2 CH_2 Cl $$

D
$$ (CH_3)_3 CCl $$

Solution

Tertiary Alkyl halide are more prone to $$\mathrm{S_N1}$$ mechanism.
Among the given options, only $$\mathrm{(CH_3)_3Cl}$$ is a tertiary halide.
Hence, Option "D" is the correct answer.
Question 5
1 / -0

$$ S_{N^1} $$ reaction is favoured by :

A
non-polar solvents

B
bulky groups on the carbon atom attached to halogen atom

C
small groups on the carbon atom attached to halogen atom

D
None of the above

Solution
Question 6
1 / -0

Which of the following will be least reactive in nucleophilic substitution?

A
$$ CH_3CH_2CH_2Cl $$

B
$$ (CH_3)_3 C-Cl $$

C
$$ CH_3-CHClCH_3 $$

D
$$ H_2C =CHCH_2Cl $$

E
$$ H_2C=CHCl $$
Question 7
1 / -0

$$ CH_3Br + Nu^- \longrightarrow CH_3 -Nu + Br^- $$
The decreasing order of the rate of the above reaction with
nucleophile $$ (Nu^- ) $$Ato D is
$$[Nu^- : (A)PhO^- , (B) AcO^- , (C) HO^- ,(D) CH_3O^- ] $$

A
D>C>A>B

B
D>C>B>A

C
A >B >C>D

D
B >D>C>A

Solution
Question 8
1 / -0

The catalyst used in the preparation of an alkyl chloride by the action of dry HCl on alcohol is:

A
Anhydrous $$ AlCl_3 $$

B
$$ FeCl_3 $$

C
Anhydrous $$ ZnCl_2 $$

D
$$ Cu $$

Solution
Question 9
1 / -0

When treated with two equivalents of sodium in dry ether gives:

A

B

C

D

Solution
Question 10
1 / -0

An ethereal solution of alkyl halide is heated with sodium metal. The reaction is known as:

A
Frankland's reaction

B
Sandmeyer's reaction

C
Wurtz-Fittig reaction

D
Wurtz reaction