Alcohols Phenols and Ethers Test

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Alcohols Phenols and Ethers Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

$$C_{2}H_{5}OH\rightarrow C_{2}H_{5}Br$$

In this conversion, the reagent is:

A
$$HBr$$

B
$$Br_{2} + CCl_{4}$$

C
$$Br_{2}$$ water

D
$$KBr$$

Solution

To convert $$C_2H_5OH$$ to $$C_2H_5Br$$, $$HBr$$ is used. Nucleophilic substitution reaction occurs in this reaction.

The correct option is 'A'.
Question 2
1 / -0

The gas liberated during fermentation is:

A
alcoholic vapours

B
$$H_2$$

C
$$CO$$

D
$$CO_{2}$$

Solution

The gas liberated is $$CO_2$$.

Option D is correct.
Question 3
1 / -0

$$CH_2OH$$
$$|$$
$$CH_2OH$$ is a :

A
$$1^{0}$$ alcohol

B
$$2^{0}$$ alcohol

C
$$3^{0}$$ alcohol

D
carbinol

Solution

$$-OH$$ group is attached to $$1^{o}$$ carbon atom.

$$1^o CH_2-OH$$
$$|$$
$$1^o CH_2-OH$$

Option A is correct.
Question 4
1 / -0

The IUPAC name of sec. butyl alcohol is:

A
1-butanol

B
2-butanol

C
2-methyl-l-butanol

D
2-methyl-2-butanol

Solution

The IUPAC name of the sec. butyl acohol is 2-butanol because the longest continue chain contain 4-carbon as well as the $$-OH$$ group is attached to 2nd carbon , hence the name is 2-butanol.
Question 5
1 / -0

Which of the following substance can be used as a raw material for obtaining alcohol?

A
Potatoes

B
Molasses

C
Maize

D
All of the above

Solution

All of them contain starch in certain quantities which can be fermented to give alcohol.

Option D is correct.
Question 6
1 / -0

Which alcohol is prepared from water gas?

A
$$C_{2}H_{5}OH$$

B
$$CH_{3}CH_{2}CH_{2}OH$$

C
$$CH_{3}OH$$

D
$$C_{6}H_{5}CH_{2}OH$$

Solution

Water gas is an equimolar mixture of $$CO$$ and $$H_2$$.

A mixture of zinc oxide and chromium oxide $$(ZnO-Cr_{2}O_{3})$$ converts water gas in methanol $$(CH_3OH)$$.

The temperature of the reaction is 573K.
$$CO +2 H_2 \xrightarrow {ZnO-Cr_{2}O_{3}} CH_3OH $$

Option C is correct.
Question 7
1 / -0

Absolute alcohol is prepared from rectified spirit by :

A
steam distillation

B
fractional distillation

C
distillation with CaO and Ca

D
simple distillation

Solution

$$Rectified \ spirit \xrightarrow{CaO + Ca} Absolute \ alcohol$$
In preparing anhydrous alcohol. Spirit react with quicklime for some days and then distill off the alcohol slowly from a water-bath and treat the product in the same way.
Question 8
1 / -0

Which of the following catalyst is used in the conversion of water gas and hydrogen into methyl alcohol?

A
$$MnO$$

B
Raney $$Ni$$

C
$$Fe$$

D
$$ZnO-Cr_{2}O_{3}$$

Solution

Water gas is an equimolar mixture of $$CO$$ and $$H_2$$.

A mixture of zinc oxide and chromium oxide $$(ZnO-Cr_{2}O_{3})$$ converts water gas into methanol $$(CH_3OH)$$.

The temperature of the reaction is 573 K.

$$CO + H_2 \xrightarrow {ZnO-Cr_{2}O_{3}} CH_3OH$$

Option D is correct.
Question 9
1 / -0

An example for a polyhydric alcohol is:

A
methyl alcohol

B
neopentyl alcohol

C
sec butyl alcohol

D
mannitol

Solution

So, mannitol is a polyhydric alcohol, because it has 6-OH groups. Rest all are monohydric alcohols because they contain single hydroxy group.

The correct option is 'D'.
Question 10
1 / -0

Which of the following soluble in water?

A
$$CH_{3}OH$$

B
$$CHCl_{3}$$

C
$$CCl_{4}$$

D
$$CS_{2}$$

Solution

Only $$CH_3OH$$ has hydrogen connected to an electronegative element, this enables it for hydrogen bonding with water. Others have $$Cl$$ connected to carbon, which makes the bond less polar, disqualifies $$Cl$$ from showing any H bonding, (moreover, only a few cases are observed where $$Cl$$ shows H Bonding).
Thus, restricting them to a weak polar or Van der Waal's interactions.

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Re-Attempt Weekly Quiz Competition

Alcohols Phenols and Ethers Test - 25

Result

Alcohols Phenols and Ethers Test - 25

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SHARING IS CARING

Question 1

$$HBr$$

$$Br_{2} + CCl_{4}$$

$$Br_{2}$$ water

$$KBr$$

Solution

Question 2

alcoholic vapours

$$H_2$$

$$CO$$

$$CO_{2}$$

Solution

Question 3

$$1^{0}$$ alcohol

$$2^{0}$$ alcohol

$$3^{0}$$ alcohol

carbinol

Solution

Question 4

1-butanol

2-butanol

2-methyl-l-butanol

2-methyl-2-butanol

Solution

Question 5

Potatoes

Molasses

Maize

All of the above

Solution

Question 6

$$C_{2}H_{5}OH$$

$$CH_{3}CH_{2}CH_{2}OH$$

$$CH_{3}OH$$

$$C_{6}H_{5}CH_{2}OH$$

Solution

Question 7

steam distillation

fractional distillation

distillation with CaO and Ca

simple distillation

Solution

Question 8

$$MnO$$

Raney $$Ni$$

$$Fe$$

$$ZnO-Cr_{2}O_{3}$$

Solution

Question 9

methyl alcohol

neopentyl alcohol

sec butyl alcohol

mannitol

Solution

Question 10

$$CH_{3}OH$$

$$CHCl_{3}$$

$$CCl_{4}$$

$$CS_{2}$$

Solution

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