Haloalkanes and Haloarenes Test

Result

Haloalkanes and Haloarenes Test - 26

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

When octa-O-methyl d-cellobiose is hydrolysed by aqueous acid, two O-methylated glucose derivatives are formed: One is tetramethyl derivative and the other is trimethyl derivative. Why is a single methyl substituent lost in this process ?

A
One methoxy group is lost by $$ \beta $$ -elimination

B
One methoxy group is an ester and the others are all ethers

C
One methoxy group is a part of an acetal,the others are all ethers

D
One glucose is an $$\alpha$$-methyl glycoside, the other is a $$\beta$$-methyl glycoside
Question 2
1 / -0

Ethyl chloride is converted to butane by :

A
Kolbes synthesis

B
Williamson's synthesis

C
Wurtz reaction

D
Gattermann reaction

Solution

Williamson's synthesis: Sodium ethoxide reacts with alkyl halide and ether forms as product.
$$RONa+RX\rightarrow ROR +NaX$$

Wurtz reaction:
$$RX+2Na+RX\rightarrow R-R+2NaX$$

It is clear from above reactions Option C is correct.
Question 3
1 / -0

Chloroethane is reacted with alcoholic potassium hydroxide. The product formed is:

A
$$C_{2}H_{6}O$$

B
$$C_{2}H_{6}$$

C
$$C_{2}H_{4}$$

D
$$C_{2}H_{4}O$$

Solution

Chloroethane reacts with alc. KOH and ethene forms.

It is a basic method for preparation of alkene.

Alcoholic KOH when used the elimination reaction takes place.

Option C is correct.
Question 4
1 / -0

Reaction of ethyl chloride with sodium leads to (in the presence of dry ether):

A
ethane

B
propane

C
n-butane

D
n-pentane

Solution

The above reaction is Wurtz Reaction where alkyl halides react with sodium in presence of dry ether to form higher hydrocarbon.

$$2C_2H_5-Cl\xrightarrow{2Na}C_4H_{10}+2NaCl$$

Option C is correct.
Question 5
1 / -0

$$1$$-Chlorobutane on reaction with alcoholic potash gives:

A
$$1$$-butene

B
$$1$$-butanol

C
$$2$$-butene

D
$$2$$-butanol

Solution

Alc. $$KOH$$ is a dehydrohalogenation agent, it reacts with an alkyl halide and alkene forms as a product.

Reaction of process:
$$CH_3CH_2CH_2CH_2Cl\xrightarrow {alc.KOH} CH_3CH_2CH=CH_2$$

Option A is correct.
Question 6
1 / -0

In the dehydrohalogenation of ethyl chloride, which of the following change occurs?

A
$$sp^{2}$$ carbon converts to $$sp^{3}$$ carbon

B
$$sp^{2}$$ carbon converts to $$sp$$ carbon

C
$$sp^{3}$$ carbon converts to $$sp$$ carbon

D
$$sp^{3}$$ carbon converts to $$sp^{2}$$ carbon

Solution

In dehydrohalogenation, alkyl halide converts into an alkene. Alkyl halide contains $$sp^3$$ carbon and alkene contains $$sp^2$$ carbon.

Hence, the correct option is 'D'.
Question 7
1 / -0

Ethyl bromide on boiling with alcoholic solutions of sodium hydroxide forms:

A
ethane

B
ethylene

C
methylene

D
all of these

Solution

$$C_2H_5-Br\xrightarrow{NaOH(alc.)}C_2H_4+HBr$$
Question 8
1 / -0

Reaction of alkyl halide with metallic sodium in presence of dry ether solution is called:

A
Friedel-Crafts reaction

B
Sandmeyers reaction

C
Wurtz reaction

D
Gabriels reaction

Solution

Wurtz reaction: Alkyl halide reacts with $$Na$$ in presence of dry ether and alkane forms.

$$RX+2Na+RX\rightarrow R-R+2NaX$$

Option C is correct.
Question 9
1 / -0

Which of the following reagents, when heated with ethyl chloride, forms ethylene?

A
$$Aq.\ KOH$$

B
$$Zn/HCl$$

C
$$Alc.\ KOH$$

D
$$HI$$

Solution

Ethyl chloride reacts with aq. $$KOH$$ and alcohol forms.
Ethyl chloride reacts with $$Zn/HCl$$ and alkane forms.
Ethyl chloride reacts with alc. $$KOH$$ and ethene forms.
The reaction of the process is:
$${ C }_{ 2 }{ H }_{ 5 }Cl \xrightarrow { alc.KOH } { CH }_{ 2 }=C{ H }_{ 2 }+HCl$$
Question 10
1 / -0

The reaction conditions leading to the best yield of $$C_{2}H_{5}Cl$$ are:

A
$$C_{2}H_{6}(excess)+Cl_{2}\rightarrow $$

B
$$C_{2}H_{6}+Cl_{2}\rightarrow $$

C
$$C_{2}H_{6}+Cl_{2}(excess)\rightarrow $$

D
none of these

Solution

Halogenation of alkanes will lead to the formation of alkyl halide.

In this reaction, if we use $$Cl_2$$ in excess, then dichloro and trichloro forms as product and if ethane is used in excess, ethyl chloride forms as major product.

So, the reaction takes place as follows:
$$C_2H_6+Cl_2\rightarrow C_2H_5Cl+HCl$$
(excess)

Option A is correct.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Haloalkanes and Haloarenes Test - 26

Result

Haloalkanes and Haloarenes Test - 26

Score

-

Rank

-

SHARING IS CARING

Question 1

One methoxy group is lost by $$ \beta $$ -elimination

One methoxy group is an ester and the others are all ethers

One methoxy group is a part of an acetal,the others are all ethers

One glucose is an $$\alpha$$-methyl glycoside, the other is a $$\beta$$-methyl glycoside

Question 2

Kolbes synthesis

Williamson's synthesis

Wurtz reaction

Gattermann reaction

Solution

Question 3

$$C_{2}H_{6}O$$

$$C_{2}H_{6}$$

$$C_{2}H_{4}$$

$$C_{2}H_{4}O$$

Solution

Question 4

ethane

propane

n-butane

n-pentane

Solution

Question 5

$$1$$-butene

$$1$$-butanol

$$2$$-butene

$$2$$-butanol

Solution

Question 6

$$sp^{2}$$ carbon converts to $$sp^{3}$$ carbon

$$sp^{2}$$ carbon converts to $$sp$$ carbon

$$sp^{3}$$ carbon converts to $$sp$$ carbon

$$sp^{3}$$ carbon converts to $$sp^{2}$$ carbon

Solution

Question 7

ethane

ethylene

methylene

all of these

Solution

Question 8

Friedel-Crafts reaction

Sandmeyers reaction

Wurtz reaction

Gabriels reaction

Solution

Question 9

$$Aq.\ KOH$$

$$Zn/HCl$$

$$Alc.\ KOH$$

$$HI$$

Solution

Question 10

$$C_{2}H_{6}(excess)+Cl_{2}\rightarrow $$

$$C_{2}H_{6}+Cl_{2}\rightarrow $$

$$C_{2}H_{6}+Cl_{2}(excess)\rightarrow $$

none of these

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.