Alcohols Phenols and Ethers Test

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Alcohols Phenols and Ethers Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

By treating alkylchloride with aq. $$KOH$$ produce:

A
alcohol

B
$$KCl$$

C
alkane

D
Both $$A$$ and $$B$$

Solution

In the presence of aqueous $$KOH$$, alkyl chloride gives the substitution product as alcohol. The reaction can be written as:
$$RCl + KOH(aq) \rightarrow ROH + KCl$$
Question 2
1 / -0

Alcohols containing only up to ___________ carbon atoms are completely miscible with water.

A
three

B
four

C
five

D
two

Solution

Hydroxyl group makes the alcohol molecule polar and these are used as protic solvents. Two opposing solubility trends in alcohols are the tendency of the polar OH to promote solubility in water and the tendency of the carbon chain to resist it. So, methanol, ethanol, propanol are miscible in water as the OH group overcomes the short carbon chain.
Question 3
1 / -0

__________ is prepared on a large scale from water gas.

A
Methanol

B
Ethanol

C
Methane

D
Ethane

Solution

Methanol is prepared on a large scale from water gas.
Water gas is an equimolar mixture of $$\displaystyle CO$$ and $$\displaystyle H_2$$. Water gas is heated with hydrogen (2:1 ratio) in presence of catalyst to form methanol.
$$\displaystyle \underset { \displaystyle \text { synthetic gas } }{ \underset { \displaystyle \text { Water gas } }{ CO+H_2 } }+H_2 \xrightarrow [ 300^oC \text { under pressure}]{Cr_2O_3 -ZnO} CH_3-OH$$
Question 4
1 / -0

What is the IUPAC Name of t-butyl alcohol?

A
Butan-2-ol

B
2-Methyl-propan-2-ol

C
Butan-1-ol

D
Propan-2-ol

Solution
Question 5
1 / -0

In the production of alcohol _____ are used.

A
alkene

B
alkynes

C
alkanes

D
both (a) and (b) above

Solution

Hydration of alkene:
In this process, concentrated $$H_2SO_4$$ is treated with alkene at room temperature to produce alkyl hydrogen sulphide. After addition of $$H_2O$$ and heated it, alkyl hydrogen sulphate hydrolysis to alcohol.
Question 6
1 / -0

IUPAC name of the compound $$CH_3-CH(CH_2CH_3)-CH_2-CH(OH)-CH_3$$ is:

A
4-Ethyl-2-pentanol

B
4-Methyl-2-hexanol

C
2-Ethyl-2-pentanol

D
3-Ethyl-2-hexanol

Solution

Longest carbon chain has 6 atoms. We number from right hand side as alcohol group at C-2 gets least number in this case and suffix used for alcohol is "-ol". Methyl group is present at C-4 position.

Thus, IUPAC name is 4-Methyl-2-hexanol.
Question 7
1 / -0

Decolorization of $$KMnO_4$$ solution takes place when it reacts with ethene. The final product of this reaction which is used as anti-freeze is:

A
ethylene glycol

B
propylene glycol

C
ethanol

D
propanol

Solution

Hydroxylation of ethene takes place in the presence of cold $$KMnO_{4}$$ to form Ethylene glycol. The reaction can be written as:
$$CH_{2}= CH_{2} \xrightarrow[25^{\circ}C]{MnO_{4}^{2-}} HOCH_{2}-CH_{2}OH + MnO_{2}$$
Question 8
1 / -0

The name of the compound :

A
Pentan-1-ol

B
Pentan-2-ol

C
Pentan-4-ol

D
None of these

Solution

The given compound has a chain of five carbon atoms and hydroxy group as the functional group.

The numbering is done from the end closer to the carbon having -OH group.

Therefore, the compound is pentan-2-ol.
Question 9
1 / -0

$$CH_3CH = CHCH_3 \xrightarrow [(i)A]{(ii) B} CH_3-\underset{OH}{\underset{|}{C}H} - \overset{OH}{\overset{|}{C}H} - CH_3$$, $$A\& B$$ are
How would you get racemic mixture of 1, 2-butane diol from cis 2- butene?

A
$$\displaystyle A=KMnO_{4}/OH^{-}, B=H_{2}O$$

B
$$\displaystyle A=CF_{3}/CO_{3}H, B=H_{2}O$$

C
$$\displaystyle A=OsO_{4}/OH^{-}, B=H_{2}O$$

D
$$\displaystyle A=O_{3}/H_{2}O, B=Ph_{3}P$$

Solution

Alkaline solution of potassium permanganate converts an alkene into vicinal diol. Cis 2- butene can be converted to the racemic mixture of 2, 3-butane diol by reaction with trifluoroperacetic acid (A) followed by hydrolysis with water (B).
The reaction with osmium tetraoxide in presence of base can be carried out in presence of tert butyl hydroperoxide. This ensures that highly toxic osmium tetraoxide is used in catalytic quantity.
Question 10
1 / -0

The reaction of an alcohol with carboxylic acid is called :

A
Combustion

B
Esterification

C
Saponification

D
None of these

Solution

The reaction of an alcohol with carboxylic acid is called esterification.

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Re-Attempt Weekly Quiz Competition

Alcohols Phenols and Ethers Test - 28

Result

Alcohols Phenols and Ethers Test - 28

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SHARING IS CARING

Question 1

alcohol

$$KCl$$

alkane

Both $$A$$ and $$B$$

Solution

Question 2

three

four

five

two

Solution

Question 3

Methanol

Ethanol

Methane

Ethane

Solution

Question 4

Butan-2-ol

2-Methyl-propan-2-ol

Butan-1-ol

Propan-2-ol

Solution

Question 5

alkene

alkynes

alkanes

both (a) and (b) above

Solution

Question 6

4-Ethyl-2-pentanol

4-Methyl-2-hexanol

2-Ethyl-2-pentanol

3-Ethyl-2-hexanol

Solution

Question 7

ethylene glycol

propylene glycol

ethanol

propanol

Solution

Question 8

Pentan-1-ol

Pentan-2-ol

Pentan-4-ol

None of these

Solution

Question 9

$$\displaystyle A=KMnO_{4}/OH^{-}, B=H_{2}O$$

$$\displaystyle A=CF_{3}/CO_{3}H, B=H_{2}O$$

$$\displaystyle A=OsO_{4}/OH^{-}, B=H_{2}O$$

$$\displaystyle A=O_{3}/H_{2}O, B=Ph_{3}P$$

Solution

Question 10

Combustion

Esterification

Saponification

None of these

Solution

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