Alcohols Phenols and Ethers Test

Result

Alcohols Phenols and Ethers Test - 35

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Weekly Quiz Competition

Question 1
1 / -0

Propene on hydration gives

A
propan-1-ol

B
propan-2-ol

C
propanal

D
methoxy ethane

Solution

Propene on hydration gives propan-2-ol
Question 2
1 / -0

The compound which reacts fastest with Lucas reagent at room temperature, is

A
butan-1-ol

B
butan-2-ol

C
2-methyl propan-1-ol

D
2-methyl propan-2-ol

Solution

Tertiary alcohol reacts fastest with Lucas reagent at room temperature.

2-methyl propan-2-ol is a tertiary alcohol, thus reacts immediately with Lucas reagent.

Hence, option D is correct.
Question 3
1 / -0

The correct order of boiling point for primary $$\left( { 1 }^{ } \right) $$, secondary $$\left( { 2 }^{ } \right) $$ and tertiary $$\left( { 3 }^{ } \right) $$ alcohols is:

A
$${ 1 }^{ } > { 2 }^{ } > { 3 }^{ }$$

B
$${ 3 }^{ } > { 2 }^{ } > { 1 }^{ }$$

C
$${ 2 }^{ } > { 1 }^{ } > { 3 }^{ }$$

D
$${ 2 }^{ } > { 3 }^{ } > { 1 }^{ }$$

Solution

Alcohols with same molecular weight are expected to have almost same boiling point however two more factors other than molecular weight are important, they are namely H-bonding and surface area of molecule. Both these factors are least in $$3$$ alcohols and maximum in $$1$$ alcohols. Hence, $$3$$ alcohols have least boiling point while $$1$$ alcohols have maximum boiling point.
Question 4
1 / -0

The nature of 2, 4, 6-trinitrophenol is:

A
neutral

B
basic

C
acidic

D
weak basic

Solution

$$2, 4, 6-trinitrophenol$$ is picric acid. It is acidic in nature. The withdrawing nature of $$NO_2$$ groups make the compound acidic.
Question 5
1 / -0

The common name for propan-2-ol is :

A
n-Propyl alcohol.

B
iso-Propyl alcohol.

C
ethyl alcohol.

D
methyl alcohol.

Solution

Isopropyl alcohol (IUPAC name 2-propanol), also called isopropanol or dimethyl carbinol.
Question 6
1 / -0

Sodium phenoxide $$\xrightarrow [ pressure ]{ { CO }_{ 2 } } A \xrightarrow [ ]{ { { H }_{ 3 }O }^{ + } } $$ o-hydroxy benzoic acid
This product can also be obtained by the reaction of which of the following?

A
Phenol + chloroform +alkali

B
Phenol + pyrene + alkali

C
Phenol + acetyl chloride + $$Al{Cl}_{3}$$

D
Phenol + methyl chloride + $$Al{Cl}_{3}$$

Solution
Question 7
1 / -0

Identify the major product X obtained in the following reaction.

$$2, 3-\text{dimethyl butan}-2-ol\xrightarrow []{Conc.H_{ 2 }SO_{ 4 }} X$$

A

B

C

D

Solution

Dehydration of alcohol occurs when the reaction proceeds in the presence of sulphuric acid.

$$({ CH_{ 3 }) }_{ 2 }HC-C(OH)({ CH_{ 3 }) }_{ 2 }\longrightarrow { (CH_{ 3 }) }_{ 2 }C=C{ (CH_{ 3 }) }_{ 2 }+{(CH_3)}_2CHC(CH_3)=CH_2$$

2,3-dimethylbut-2-ene and 2,3-dimethylbut-1-ene are formed in which 2,3-dimethylbut-2-ene is major product.
Question 8
1 / -0

Which of the following compounds shows evidence of the strongest hydrogen bonding?

A
Propan$$-1-ol$$

B
Propan$$-2-ol$$

C
Propan$$-1,\,2-diol$$

D
Propane$$-1,\,2,\,3-triol$$

Solution

Propan $$-1,\,2,\,3$$ triol have three polar $$-OH$$ groups. Thus, it has maximum H-bonding.
Question 9
1 / -0

What amount of bromine will be required to convert $$2\ g$$ of phenol into $$2, 4, 6-tribromophenol$$?

A
$$4.00$$

B
$$6.00$$

C
$$10.22$$

D
$$20.44$$

Solution

Write equation for chemical change, find molecular masses of reactants and products and solve it.
Molecular weight of phenol
$$= 12\times 6 + 1 \times 6 + 16 = 94$$
Molecular wt. of $$Br_{2} = 3\times 160 = 480$$
$$\because 94$$ of phenol requires $$= 480\ g$$ of $$Br_{2}$$
$$\therefore 2\ g$$ of phenol requires $$= \dfrac {480}{94} \times 2 = 10.22\ g$$

The correct answer is 10.22 g
Question 10
1 / -0

The best method to separate the mixture of ortho and para-nitrophenol $$(1:1)$$ is:

A
vaporization

B
color spectrum

C
distillation

D
crystallization

Solution

Ortho and para-nitrophenol have significant differences in their boiling points because ortho-nitrophenol forms intramolecular hydrogen bonds and has lower boiling point than para-nitrophenol which has intermolecular hydrogen bonding. Therefore, distillation is the correct answer as it separates components of a mixture on the basis of their difference in boiling points.