Alcohols Phenols and Ethers Test

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Alcohols Phenols and Ethers Test - 36

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the following methods is used to prepare $$Me_{3}COEt$$ with a good yield?

A
Mixing $$EtONa$$ with $$Me_{3}CCl$$

B
Mixing $$Me_{3}CONa$$ with $$EtCl$$

C
Heating a mixture of $$(1 : 1) EtOH$$ and $$Me_{3}COH$$ in the presence of $$conc. H_{2}SO_{4}$$

D
Treatment of $$Me_{3}COH$$ with $$EtMgI$$

Solution

$$Me_{3} CONa\underset {\underset {-NaCl}{(1^{\circ} alkyl\ halide)}}{\xrightarrow {EtCl}} Me_{3} COEt$$

This reaction is known as Williamson's synthesis.

So, the correct option is $$B$$
Question 2
1 / -0

In iodine charge transfer test the color of ether compound formed is:

A
blue

B
pale yello

C
brown

D
dark red

Solution

The correct option is $$C$$. Ether forms charge transfer complexes with Iodine to give a brown solution.
$$R-O-R'\longrightarrow R'I-+RI+H_2O$$
Question 3
1 / -0

The miscibility of ether with _______ resembles those of alcohol of the same molecular mass.

A
methanol

B
water

C
DCM

D
benzene

Solution

The miscibility of ether with water resembles those of alcohol of the same moleculer mass. It is generally due to the hydrogen bonding with water in alcohol. So the correct option is $$B$$.
Question 4
1 / -0

Which of the following is the functional group of an ether?

A
$$R - OH$$

B
$$R - O - R$$

C
$$R-CO-R'$$

D
$$R-COOH$$

E
$$RCHO$$

Solution

The correct option is B. $$R-O-R$$ is generally the functional group of the ether which is non-polar and does not form hydrogen bonding.
Question 5
1 / -0

The_____ ethers are highly volatile and flammable.

A
Higher

B
Lower

C
Both A and B

D
None of these

Solution
Question 6
1 / -0

With ethoxyethane which compound is miscible to almost the same extent?

A
Formaldehyde

B
Bhutanone

C
Butan-1-ol

D
Propan-1-ol

Solution

The correct option is $$C$$. Ethoxyethane is an ether group which is miscible to the alcohol that is Butan $$-1-$$ol. This is because they have the same molecular mass.
Question 7
1 / -0

Which of the following alcohols forms a ketone when oxidized?

A
1-Propanol

B
Methanol

C
2-Methyl-2-propanol

D
2-Propanol

Solution

2-propanol (a secondary alcohol) forms a ketone when oxidized.
$$\displaystyle CH_3 - \underset {   \underset {\displaystyle OH}{|} }{C} H- CH_3 \xrightarrow { \text {oxidation}} CH_3 - \underset {   \underset {\displaystyle O}{||} }{C} - CH_3 $$
1-propanol and methanol (primary alcohols) forms aldehydes when oxidized.
$$\displaystyle CH_3 -CH_2- \underset {   \underset {\displaystyle OH}{|} }{C} H_2 \xrightarrow { \text {oxidation}} CH_3-CH_2 - \underset {   \underset {\displaystyle O}{||} }{C} - H $$
$$\displaystyle CH_3 -OH \xrightarrow { \text {oxidation}} H- \underset {   \underset {\displaystyle O}{||} }{C} - H $$
2-methyl-2-propanol ($$\displaystyle (CH_3)_3 C -OH $$) is a tertiary alcohol whose oxidation requires drastic conditions. The number of $$C$$ atoms in the oxidation product are less than the number of $$C$$ atoms in the starting material.
Question 8
1 / -0

Ethers show dipolar nature due to the presence of ______.

A
central C atom

B
central O atom

C
central N atom

D
none of these

Solution

Ethers have general structural formula R-O-R'. Hence all of them have the C-O bond. We know that the C-O bond is polar due to the difference between the electronegativities of carbon and oxygen. Hence, ethers show dipolar nature.
Question 9
1 / -0

$$CH_3OH\xrightarrow{P+I_2}A \xrightarrow{Mg/dry\ ether}B\xrightarrow{HCHO}C\xrightarrow{{H^+/H_2O}}D$$

What are $$B$$ & $$D$$ respectively?

A
$$CH_3MgI$$, $$CH_3CHO$$

B
$$CH_3MgI$$, $$CH_3CH_2OH$$

C
$$CH_3MgI$$, $$CH_3COOH$$

D
$$CH_3MgI$$, $$CH_3COCH_3$$

Solution

$$CH_3OH\xrightarrow{P+I_2}CH_3I \xrightarrow{Mg/dry\ ether}CH_3MgI\xrightarrow{HCHO}CH_3CH_2OMgI\xrightarrow{{H^+/H_2O}}CH_3CH_2-OH$$

Hence $$B$$ is the correct answer.
Question 10
1 / -0

_____________ is prepared on a large seals from water gas.

A
Methanol

B
Ethanal

C
Methane

D
Ethanol

Solution

Methanol is generally prepared on a large scale using water gas. Water gas is also called syn gas is the mixture of $$(CO+{ H }_{ 2 }).$$

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Alcohols Phenols and Ethers Test - 36

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Alcohols Phenols and Ethers Test - 36

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Question 1

Mixing $$EtONa$$ with $$Me_{3}CCl$$

Mixing $$Me_{3}CONa$$ with $$EtCl$$

Heating a mixture of $$(1 : 1) EtOH$$ and $$Me_{3}COH$$ in the presence of $$conc. H_{2}SO_{4}$$

Treatment of $$Me_{3}COH$$ with $$EtMgI$$

Solution

Question 2

blue

pale yello

brown

dark red

Solution

Question 3

methanol

water

DCM

benzene

Solution

Question 4

$$R - OH$$

$$R - O - R$$

$$R-CO-R'$$

$$R-COOH$$

$$RCHO$$

Solution

Question 5

Higher

Lower

Both A and B

None of these

Solution

Question 6

Formaldehyde

Bhutanone

Butan-1-ol

Propan-1-ol

Solution

Question 7

1-Propanol

Methanol

2-Methyl-2-propanol

2-Propanol

Solution

Question 8

central C atom

central O atom

central N atom

none of these

Solution

Question 9

$$CH_3MgI$$, $$CH_3CHO$$

$$CH_3MgI$$, $$CH_3CH_2OH$$

$$CH_3MgI$$, $$CH_3COOH$$

$$CH_3MgI$$, $$CH_3COCH_3$$

Solution

Question 10

Methanol

Ethanal

Methane

Ethanol

Solution

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