Alcohols Phenols and Ethers Test

Result

Alcohols Phenols and Ethers Test - 56

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is phenolic

A
Phthalic acid

B
Phosphoric acid

C
Picric acid

D
Phenylacetic acid

Solution

Picric acid is phenolic while others are non phenolic
Question 2
1 / -0

The structural formula of cyclohexanol is

A

B

C

D

Solution
Question 3
1 / -0

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

A
Protonation of alcohol molecule

B
Formation of carbocation

C
Elimination of water

D
Formation of an ester

Solution

$$H_2SO_4 \rightarrow H^+ + HSO_4^-$$

In the first step protonation of alcohol molecule takes place.

Option A is correct.
Question 4
1 / -0

Dehydration of ethanol gives

A
Acetic acid

B
Ethane

C
Ethylene

D
Acetylene

Solution

$$ CH_3-CH_2-OH \xrightarrow [170^0]{Conc.H_2SO_4} CH_2 =CH_2 +H_2O $$

Option C is correct.
Question 5
1 / -0

Wine (alcoholic beverages) contains:

A
$$ CH_3OH $$

B
Glycerol

C
$$ C_2H_5OH $$

D
2-propanol

Solution

Alcoholic beverage, any fermented liquor, such as wine, beer, or distilled spirit, that contains ethyl alcohol, or ethanol $$(CH_3CH_2OH)$$, as an intoxicating agent.
Hence, option $$C$$ is the answer.
Question 6
1 / -0

In the following series of chemical reactions, identify Z $$ C_3H_7OH \quad \xrightarrow [ 160-180^{ 0 }C ]{ Conc.H_{ 2 }SO_{ 4 } } X\xrightarrow [ ]{ Br_2 }Y\xrightarrow [ Excess\ of ]{ Alc. KOH } Z $$

A
$$CH_3 - \underset{NH_2}{\underset{\!\!\!\!|}{CH}} - \underset{NH_2}{\underset{\!\!\!\!|}{CH_2}}$$

B
$$CH_3 - \underset{OH}{\underset{\!\!\!\!|}{CH}} - \underset{\!\!\!\!OH}{\underset{\!\!\!\!\!\!\!|}{CH_2}}$$

C
$$CH_3 - \underset{OH}{\underset{|}{C}} = CH_2$$

D
$$ CH_3C \quad \equiv \quad CH $$

Solution

$$ CH_3CH_2CH_2OH \xrightarrow [160-18060 C]{conc.H_2SO_4} CH_3CH =CH_2 \xrightarrow []{Br_2} CH_3 - \underset{Br}{\underset{\!\!\!\!|}{CH}} - \underset{Br}{\underset{\!\!\!\!|}{CH_2}}\xrightarrow {Alc.KOH} \underset{Propyne}{CH_3-C\equiv CH}$$
Question 7
1 / -0

The reaction of $$ C_2H_5OH $$ with $$ H_2SO_4 $$ does not give

A
Ethylene

B
Diethyl ether

C
Acetylene

D
Ethyl hydrogen sulphate

Solution

Option C is correct.
Question 8
1 / -0

Propan-1-ol can be prepared from propene by alcohol

A
$$ H_2O/H_2SO_4 $$

B
$$ Hg(OAc)_2/H_2 O $$ followed by $$ NaBH_4 $$

C
$$ B_2H_6 $$ followed by $$ H_2O_2 $$

D
$$ CH_3CO_2H/H_2SO_4 $$

Solution

$$ 6CH_3-CH=CH_2+B_2H_6 \xrightarrow []{H_2O_2} CH_3-CH_2-CH_2OH $$
Preparation of Propan-1-ol is shown in the above reaction.

Option C is correct.
Question 9
1 / -0

In the following sequence of reactions
$$CH_3CH_2CH_2Br \overset{KOH(alc)}{\longrightarrow} (A) \overset{HBr}{\longrightarrow} (B) \overset{KOH (aq.)}{\longrightarrow} (C).$$
The product (C) is

A
Propan - 2 - ol

B
Propan - l - ol

C
Propyne

D
Propene

Solution
Question 10
1 / -0

One of the following that cannot undergo dehydro - halogenation is

A
Iso - propyl bromide

B
Ethanol

C
Ethyl bromide

D
None of these

Solution

Ethanol doesn't have any halogen group. Thus ethanol cannot undergo dehydrohalogenation.