Alcohols Phenols and Ethers Test

Result

Alcohols Phenols and Ethers Test - 54

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Weekly Quiz Competition

Question 1
1 / -0

The only alcohol that can be prepared by the indirect hydration of alkene is:

A
Methyl alcohol

B
Ethyl alcohol

C
Propyl alcohol

D
Isobutyl alcohol

Solution

Except for ethyl alcohol, no other primary alcohol can be prepared by this method as the addition of $$H_2SO_4$$ follows Markownikoff's rule. Generally, secondary and tertiary alcohols are obtained.

So option B is correct.
Question 2
1 / -0

Acid catalysed hydration of alkenes except ethene leads to the formation of.

A
Primary alcohol

B
Secondary or tertiary alcohol

C
Mixture of primary and secondary alcohols

D
Mixture of secondary and tertiary alcohols

Solution

Alkenes react with water in the presence of acid as a catalyst to form alcohol. In case of unsymmetrical alkenes, OH is added to the carbon having fewer hydrogen atoms according to Markovnikov's rule.
Hence, acid catalyzed hydration of alkenes except ethene leads to the formation of secondary or tertiary alcohol. To obtain primary alcohol, hydroboration oxidation is used.
Hence, option $$B$$ is correct.
Question 3
1 / -0

Among the following compounds which can be dehydrated very easily?

A
$$CH_3CH_2CH_2CH_2CH_2OH$$

B

C

D

Solution

The ease of dehydration of alcohols is tertiary > secondary > primary according to the order of stability of the carbocations.

The more stable carbocation is generated, thus more easily it will be dehydrated.

Option C is correct.
Question 4
1 / -0

Wood spirit if known as?

A
Ethanol

B
Methanol

C
Acetone

D
Benzene

Solution

Methanol is the contraction of Methyl Alcohol. Methanol may also be called, wood alcohol or wood spirit because it can be produced as a by-product of the wood distillation

B is correct option
Question 5
1 / -0

During dehydration of alcohols to alkenes by heating with conc. $$H_2SO_4$$, the initiation step is:

A
Elimination of water

B
Formation of an ester

C
Formation of carbocation

D
Protonation of alcohol molecule

Solution

Dehydration of alcohol to alkene in presence of concentrated $$H_2SO_4$$ involves following steps :
Thus, the initiation step is protonation of alcohol.
Question 6
1 / -0

Which of the following is soluble in water?

A
$$CS_2$$

B
$$C_2H_5OH$$

C
$$CCl_4$$

D
$$CHCl_3$$

Solution

Ethanol $$(C_2H_5OH)$$ forms hydrogen bonding with water.
Hence, it is soluble in water. Option (B) is correct.
Question 7
1 / -0

Reaction, $$\underset{Water gas}{\underbrace{CO+H_2}}+H_2\overset{673K, 300 atm.}{\underset{Cr_2O_3-ZnO}{\rightarrow}}?$$ may be used for manufacture of:

A
$$HCHO$$

B
$$CH_3COOH$$

C
$$HCOOH$$

D
$$CH_3OH$$

Solution

Preparation of methanol includes catalytic reduction of carbon monoxide. For this purpose, water gas is used.

Water gas is an equimolar mixture of $$CO and H2.$$

A mixture of zinc oxide and chromium oxide $$(ZnO−Cr_2O_3)$$ converts water gas in methanol $$(CH_3OH)$$.

The temperature of the reaction is 673 K and pressure is 300 atm.
$$CO+2H_2\overset{ZnO−Cr_2O_3}{\longrightarrow} CH_3OH$$
Question 8
1 / -0

IUPAC name of tertiary butyl alcohol is

A
Butan-1-ol

B
Butan-2-ol

C
2-methyl propan-1-ol

D
2-methyl propan-2-ol

Solution

IUPAC name of tertiary butyl alcohol is 2-methylpropan-2-ol.
Question 9
1 / -0

Isopropyl benzene on air oxidation in the presence of dilute acid gives

A
$$C_{6}H_{5}COOH$$

B
$$C_{6}H_{5}COCH_{3}$$

C
$$C_{6}H_{5}CHO$$

D
$$C_{6}H_{5}OH$$

Solution
Question 10
1 / -0

Which of the following alcohols will dehydrate most rapidly when treated with conc. $$H_2SO_4$$?

A

B

C

D
$$CH_3-CH_2-CH_2-CH_2-OH$$

Solution