Alcohols Phenols and Ethers Test

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Alcohols Phenols and Ethers Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

Assertion : Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid.

Reason : Lewis acid polarises the bromine molecule

A
Assertion and reason both are correct and reason is correct explanation of assertion.

B
Assertion and reason both are wrong statements.

C
Assertion is correct statement but reason is wrong statement.

D
Assertion is wrong statement but reason is correct statement.

Solution

Bromination of phenol cannot be carried out in presence of Lewis acid.
Question 2
1 / -0

Assertion : o-Nitrophenol is less soluble in water than the m- and p-isomers.

Reason : m- and p- Nitrophenols exist as associated molecules.

A
Assertion and reason both are correct and reason is correct explanation of assertion.

B
Assertion and reason both are wrong statements.

C
Assertion is correct statement but reason is wrong statement.

D
Assertion is wrong statement but reason is correct statement.

Solution

Due to intramolecular hydrogen bonding o-Nitrophenol does not form hydrogen bond with water.
Question 3
1 / -0

Assertion : Ethanol is a weaker acid than phenol.

Reason : Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.

A
Assertion and reason both are correct and reason is correct explanation of assertion.

B
Assertion and reason both are wrong statements.

C
Assertion is correct statement but reason is wrong statement.

D
Assertion is wrong statement but reason is correct statement.

Solution

Phenoxide ion is stabilized by resonance which is not possible in alkoxide ion.
Question 4
1 / -0

Assertion : Phenol forms 2, 4, 6 – tribromophenol on treatment with \(Br_2\) in carbon disulphide at 273K.

Reason : Bromine polarises in carbon disulphide.

A
Assertion and reason both are correct and reason is correct explanation of assertion.

B
Assertion and reason both are wrong statements.

C
Assertion is correct statement but reason is wrong statement.

D
Assertion is wrong statement but reason is correct statement.

Solution

Correct assertion: Phenol on treatment with bromine water can form 2,4,6- tribromophenol

Correct reason: In water, phenol gives phenoxide ions which activate the ring towards electrophilic substitution reaction.
Question 5
1 / -0

Assertion : Phenols give o- and p-nitrophenol on nitration with conc. \(HNO_3\) and \(H_2SO_4\) mixture.

Reason : —OH group in phenol is o–, p– directing.

A
Assertion and reason both are correct and reason is correct explanation of assertion.

B
Assertion and reason both are wrong statements.

C
Assertion is correct statement but reason is wrong statement.

D
Assertion is wrong statement but reason is correct statement.

Solution

Phenol on treatment with dil. \(HNO_3\) form o-nitrophenol and p-nitrophenol.
Question 6
1 / -0

When phenol is treated with excess \(Br_2/\)water. It gives

A
m-bromophenol

B
o- and p-bromophenols

C
2,4-dibromophenol

D
2,4,6 -tribromophenol.

Solution

Phenol on reaction with excess bromine water gives 2,4,6 -tribromophenol.
Question 7
1 / -0

Ethanol and dimethyl ether form a pair of functional isomers. The boiling point of ethanol is higher than that of dimethyl ether. due to the presence of

A
H-bonding in ethanol

B
H-bonding in dimethyl ether

C
CH: group in ethanol

D
\(CH_3\) group in dimethyl ether.

Solution

Hydrogen bonding in ethanol.
Question 8
1 / -0

Which one of the following compounds is resistant to nucleophilic attack by hydroxyl ions?

A
Diethyl ether

B
Acetonitrile

C
Acetamide

D
Methyl acelate

Solution

Diethyl ether is a saturated compound, so it is resistant to nucleophilic attack by a hydroxyl ion (\(OH^- \)).

Other compounds have unsaturation and the unsaturated 'C' atom bears partial +ve charge, therefore they undergo easy nucleophilic attack by \(OH^- \) ion.
Question 9
1 / -0

When 3, 3-dimethylbutan-2-ol is heated with conc. \(H_2SO_4\) the major product obtained is:

A
2, 3-dimethyl but-1-ene

B
3, 3-dimethyl but-1-ene

C
2, 3-dimethyl but-2-ene

D
cis and trans isomers of 2, 3-dimethyl but-2- ene

Solution

When 3, 3-dimethylbutan-2-ol is heated with conc. \(H_2SO_4\) the major product obtained is 2, 3-dimethyl but-2-ene.

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Re-Attempt Weekly Quiz Competition

Alcohols Phenols and Ethers Test - 19

Result

Alcohols Phenols and Ethers Test - 19

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SHARING IS CARING

Question 1

Assertion and reason both are correct and reason is correct explanation of assertion.

Assertion and reason both are wrong statements.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but reason is correct statement.

Solution

Question 2

Assertion and reason both are correct and reason is correct explanation of assertion.

Assertion and reason both are wrong statements.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but reason is correct statement.

Solution

Question 3

Assertion and reason both are correct and reason is correct explanation of assertion.

Assertion and reason both are wrong statements.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but reason is correct statement.

Solution

Question 4

Assertion and reason both are correct and reason is correct explanation of assertion.

Assertion and reason both are wrong statements.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but reason is correct statement.

Solution

Question 5

Assertion and reason both are correct and reason is correct explanation of assertion.

Assertion and reason both are wrong statements.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but reason is correct statement.

Solution

Question 6

m-bromophenol

o- and p-bromophenols

2,4-dibromophenol

2,4,6 -tribromophenol.

Solution

Question 7

H-bonding in ethanol

H-bonding in dimethyl ether

CH: group in ethanol

\(CH_3\) group in dimethyl ether.

Solution

Question 8

Diethyl ether

Acetonitrile

Acetamide

Methyl acelate

Solution

Question 9

2, 3-dimethyl but-1-ene

3, 3-dimethyl but-1-ene

2, 3-dimethyl but-2-ene

cis and trans isomers of 2, 3-dimethyl but-2- ene

Solution

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