Phenols and Ethers Test

Result

Phenols and Ethers Test - 5

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Weekly Quiz Competition

Question 1
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Aldehydes are reduced to the corresponding alcohols by addition of hydrogen in the presence of catalysts to form

A
primary alcohols

B
secondary alcohols

C
tertiary alcohols

D
None of these

Solution
Question 2
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Alcohols have high boiling points because of

A
increase in van der Waals forces

B
presence of intermolecular hydrogen bonding in them

C
increase in the number of carbon atoms

D
All of these

Solution

Alcohols have strong H bonding.
Question 3
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Lucas test is associated with

A
Phenols

B
Aldehydes

C
Carboxylic acid

D
Alcohols

Solution

Lucas test is distinguishing test for alcohols.
Question 4
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An organic compound containing oxygen, upon oxidation forms a carboxylic acid as the only organic product with its molecular mass higher by 14 units. The organic compound is ______.

A
a primary alcohol

B
an aldehyde

C
a secondary alcohol

D
a ketone

Solution

When –CH₂ OH group is replaced by –COOH group then only molecular wt will increase by 14units.
Question 5
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The process of converting alkyl halides into alcohols involves_____________.

A
rearrangement reaction

B
substitution reaction

C
dehydrohalogenation reaction

D
addition reaction

Solution

Converstion of alcohol to alkyl halide is via substitution reaction.
Question 6
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Which of the following compounds will react with sodium hydroxide solution in water?

A
C₆ H₅ OH

B
C₆ H₅ CH₂ OH

C
(CH₃ )₃ COH

D
C₂ H₅ OH

Solution

The correct answer is Option A.
Phenol (C₆ H₅ OH) will react with sodium hydroxide solution in water , as phenols are more acidic than alcohols.
Question 7
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The reaction which involves dichlorocarbene as an electrophile is

A
Reimer –Tiemann reaction

B
Kolbe ’s reaction

C
Friedel –Craft ’s acylation

D
Fittig ’s reaction

Solution

The correct answer is Option A.

Reimer Tiemann reaction which converts phenol to ortho- hydroxybenzaldehyde involves the formation of dichlorocarbene which acts as an electrophile and attacks on the ortho position of phenol.
Question 8
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An organic compound X is oxidised by using acidified K₂ Cr₂ O₇ . The product obtained reacts with Phenyl hydrazine but does not answer silver mirror test. The possible structure of X is

A
CH₃ CH₂ OH

B
CH₃ CHO

C
(CH₃ )₂ CHOH

D
None of the these

Solution

Since the product of oxidation reacts with phenyl hydrazine, it is a carbonyl compound. Since it does not answer silver mirror test, it must be a ketone. Ketones are produced by the oxidation of secondary alcohols. So the compound X is isopropyl alcohol
Question 9
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Methyl bromide is converted into ethane by heating it in ether medium with

A
Al

B
Cu

C
Zn

D
Na

Solution

Wurtz reaction.
Question 10
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One of the following alcohol is a poison and Ingestion of even small quantities can cause blindness and large quantities causes even death.

A
methanol

B
propanol

C
ethanol

D
None of the above

Solution

Methanol is apoison and ingestion of even trace quantity can be fatal.
Question 11
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The starting material for picric acid is,

A
o –nitrophenol

B
p –nitrophenol

C
phenol –2, 4 –disulphonic acid

D
phenol

Solution

Pictric acid is trinitroderivative of phenol.
Question 12
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Give IUPAC name of the compound given below.

A
2 –Chloro –5 –hydroxyhexane

B
5-Chloro-2-hexanol

C
5 –Chlorohexan –2 –ol

D
2 –Chlorohexan –5 –ol

Solution

The correct answer is Option C.
Given molecule:

For IUPAC nomenclature following steps are followed:
1. Identify the functional group and their priority: -OH and -Cl are the side groups in the given molecule. OH has higher priority thus the name will have the suffix "ol ".
2. Identify parent chain: The longest carbon chain that contains the functional group. Here its 6 C chain i.e hexyl
3. Assign locant number: lowest number to the main functional group and side chains i.e. 2-ol
4. Identify side chains/groups: its chloro, and 5-chloro in the given molecule.

IUPAC name is: 5-chlorohexan-2-ol
Question 13
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Phenol is less acidic than ______________.

A
o –nitrophenol

B
o –methoxyphenol

C
ethanol

D
o –methylphenol

Solution

Phenol is less acidic than O −nitrophenol. Nitro group is an electron-withdrawing group. It decreases electron density on benzene ring and delocalizes negative charge of phenoxide ion. It increases acidity. Hence, O −nitrophenol is more acidic than phenol.

On the other hand, methoxy group is an electron releasing group. It increases electron density on benzene ring and does not delocalizes negative charge of phenoxide ion. It decreases acidity. Hence, p −methoxyphenol is less acidic than phenol. Also, alcohols (2 − methylpropanol and 2,2 − dimethyl pentanol) are neutral.
Question 14
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A hydrocarbon C₅ H₁₀ does not react with chlorine in dark but gives a single monochloro compound C₅ H₉ Cl in bright sunlight. The hydrocarbon is

A
Cyclopentene

B
Cyclopentane

C
Cycloalkyne

D
None of these

Solution

Since monochlorinated compound is formed so that menas all the hydrogens are same.
Question 15
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Which of the following species can act as the strongest base?

A

B

C

D
RO^-

Solution

RO^- has more electron density.