Alcohols Phenols and Ethers Test

Result

Alcohols Phenols and Ethers Test - 82

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Weekly Quiz Competition

Question 1
1 / -0

An organic compound X on treatment with acidified $$ K_2Cr_2O_7 $$ gives a compound Y which reacts with $$ I_2 $$ and sodium carbonate to form tri-iodomethane. The compound X is

A
$$ CH_3OH $$

B
$$ CH_3-CO-CH_3 $$

C
$$ CH_3CHO $$

D
$$ CH_3CH(OH)CH_3 $$

Solution
Question 2
1 / -0

The reagent used for the dehydration of an alcohol is

A
Phosphorus pentachloride

B
Calcium chloride

C
Aluminium oxide

D
Sodium chloride

Solution
Question 3
1 / -0

Ether which is liquid at room temperature is

A
$$ C_2H_5OCH_3 $$

B
$$ CH_3OCH_3 $$

C
$$ C_2H_5OC_2H_5 $$

D
None of these

Solution

$$ CH_3OCH_3 $$ and $$ C_2H_5OCH_3 $$ are gases at room temperature while $$ C_2H_5OC_2H_5 $$ (b.p 308K) is low boiling liquid.

Option B is correct.
Question 4
1 / -0

The compound which gives the most stable carbonium ion on dehydration is

A

B

C

D

Solution

Tertiary carbonium ion is the most stable and it will be given by dehydration of tertiary alcohol.
Option B is correct.
Question 5
1 / -0

Maximum solubility of alcohol in water is due to

A
Covalent bond

B
Ionic bond

C
H-bond with $$ H_2O $$

D
None of the above

Solution

Alcohol is soluble in water due to H-bonding.
Option C is correct.
Question 6
1 / -0

Phenol at $$ 25^0 c $$ is

A
A white crystalline solid

B
A transparent liquid

C
A gad

D
yellow solution

Solution

Phenol is an aromatic organic compound which is a white crystalline solid that is volatile at $$25^0C$$.
So, the answer is option $$A$$.
Question 7
1 / -0

Dehydrogenation of gives

A
Acetone

B
Acetaldehyde

C
Acetic acid

D
Acetylene

Solution
Question 8
1 / -0

In which of the following reaction, phenol or sodium phenoxide is not formed:

A
$$ C_6H_5N_2^+Cl^- + alc. KOH \rightarrow $$

B
$$ C_6H_5OCl + NaOH \rightarrow $$

C
$$ C_6H_5OCl + aq. NaOH \rightarrow $$

D
$$ C_6H_5N_2^{+}Cl^- \ \xrightarrow [ \Delta ]{ H_{ 2 }O } $$
Question 9
1 / -0

Sodium ethoxide is a specific reagent for

A
Dehydration

B
Dehydrogenation

C
Dehydrohalogenation

D
Dehalogenation

Solution

$$CH_3 - CH_2 - CH_2 - Br \xrightarrow[\text{Dehydrohalogenation}]{C_2H_5ONa} CH_3 - CH = CH_2 + HBr$$
Question 10
1 / -0

Which will dehydrate easily?

A
3-methyl-2-butanol

B
Ethyl alcohol

C
2-methyl propane-2-ol

D
2-methyl butanol

Solution

The more stable carbocation is generated, thus more easily it will be dehydrated.
The order of stability of carbocation is:
$$tertiary>secondary>primary$$

Primary alcohol produces primary carbocation, secondary alcohol produces secondary carbocation and tertiary alcohol gives tertiary carbocation.
So, tertiary alcohol will dehydrate easily.

Hence, option $$C$$ is correct.