Haloalkanes and Haloarenes Test

Result

Haloalkanes and Haloarenes Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

In chlorination of benzene in presence of $$ FeCl_{3}$$, function of $$ FeCl_{3}$$ is :

A
to provide halogen.

B
to form electrophile.

C
resonance stabilisation.

D
act as a catalyst.

Solution

Since $$FeCl_3$$ is generated again after the reaction hence it is acting as catalyst.
Question 2
1 / -0

The IUPAC name is: $$H-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{Cl}{\overset{|}{C}}}}-Cl$$

A
$$1,2$$ - dichoroethane

B
$$2,2$$ - dichloroethane

C
$$1,1$$ - Dichloroethane

D
dichloroethane

Solution

The numbering of carbon chain is done from the carbon which is having two chlorine atoms.

The parent alkane containing two carbon atoms is called as ethane and hence the IUPAC name of this compound is 1,1-Dichloroethane.

Option C is correct.
Question 3
1 / -0

What is the hybridisation of carbon that is attached to chlorine atom in n-primary alkyl halide?

A
$$sp^3$$

B
$$sp^2$$

C
$$sp$$

D
$$sp^3d$$

Solution

n-primary alkyl halide is $$R-CH_2-Cl$$.
In alkyl halides (saturated alkyl halides), halogen is always attached to $$sp^3$$ carbon.
Question 4
1 / -0

The reagent used for dehydrohalogenation is ____________.

A
$$H_2O_2$$

B
$$K_2SO_4$$

C
alcoholic $$KOH$$

D
none of the above

Solution

It is type of organic reaction in which the alkyl halide when boiled with alc.alkali gives corresponding alkene. It is also known as beta-Elimination reaction.
Question 5
1 / -0

The final product C, obtained in this reaction,would be :

A

B

C

D

Solution

To get a monobromo compound, the amino group is acetylated before bromination. After bromination, bromoacetanilide is acid hydrolysed to yield the desired halogenated amine.
Question 6
1 / -0

Alkyl halide reacting with metallic sodium in dry ether solution is called:

A
Friedel-crafts reaction

B
Sandmeyer reaction

C
Wurtz reaction

D
Gabriels reaction

Solution

The Wurtz reaction is a coupling reaction in which two alkyl halides are reacted with sodium metal in dry ether solution to form a higher alkane:

$$2RX+2Na\rightarrow R-R+2Na^+X^-$$
Question 7
1 / -0

Which of the following undergoes nucleophilic substitution exclusively by $$S_N{1}$$ mechanism?

A
ethyl chloride

B
isopropyl chloride

C
benzyl chloride

D
chlorobenzene

Solution

In, Benzyl chloride carbocation formed will be the most stable out of the given options as that carbocation is stabilized by resonance.

Therefore, answer is benzyl chloride.
Question 8
1 / -0

The IUPAC name of the compound $$CH_3-CH(CH_3)-CH_2-CH_2Cl$$ is:

A
1-chloro-3-methylbutane

B
2-methyl-4-chlorobutane

C
2-methyl-1-chlorobutane

D
1-chloropentane

Solution

IUPAC name of given compound is 1-Chloro-3-methylbutane. The parent chain has 4 carbon atoms with a chlorine atom as the substituent at C-1 & methyl group as the substituent at C-3 (chlorine is given preference over methyl).
Question 9
1 / -0

IUPAC name of $$(CH_{3})_{2}CH - CH_{2} - CH_{2}Br$$ is:

A
1-Bromopentane

B
2-Methyl-4-bromobutane

C
1-Bromo-3-methylbutane

D
2-Methyl-3-bromobutane

Solution

$$IUPAC$$ name of $$(CH_{3})_{2}CH-CH_{2}-CH_{2}Br$$ is 1-Bromo-3-methylbutane. The parent chain has 4 carbon atoms with a methyl substituent ($$CH_{3}$$) at $$C-3$$ and a bromine atom at $$C-1$$.
Question 10
1 / -0

Find out the incorrect statement.

A
It gives total 9 allylic brominated products

B
All allylic brominated products are optically active

C
Substrate has 7 allylic hydrogens

D
NBS gives Br constantly to reaction mixture.

Solution

In this reaction NBS gives $$Br$$ constantly to reaction mixture which attacks at allylic position and forms bromo products.
here, substrate has $$7$$ allylic hydrogens and forms $$9$$ allylic brominated products out of which this product is optically inactive.