Carbon and its Compounds Test

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Carbon and its Compounds Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following represents saponification reaction?

A
$$CH_{3}COONa + NaOH \xrightarrow{CaO} CH_{4} + Na_{2}CO_{3}$$

B
$$CH_{3}COOH + C_{2}H_{5}OH \xrightarrow{H_{2}SO_{4}} CH_{3} COOC_{2}H_{5} +H_{2}O$$

C
$$2CH_{3}COOH + 2Na \rightarrow 2CH_{3} COONa + H_{2}$$

D
$$CH_{3}COOC_{2}H_{5} + NaOH \rightarrow CH_{3} COONa + C_{2} H_{5}OH$$

Solution

Saponification is the alkaline hydrolysis of esters to form soap and alcohol.

$$CH_{3}COOC_{2}H_{5} + NaOH \rightarrow CH_{3}COONa + C_{2}H_{5}OH$$

Therefore, the correct answer is option D.
Question 2
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Observe the following pairs of organic compounds:

(I) $$C_{4}H_{9}OH$$ and $$C_{5}H_{11} OH$$
(II) $$C_{5}H_{11} OH$$ and $$C_{7}H_{15}OH$$
(III) $$C_{3}H_{7}OH$$ and $$C_{6}H_{13}OH$$

Which of these pairs belong to the same homologous series?

A
(III) only

B
(II) only

C
(I) only

D
All of these

Solution

Homologous series is a series of compounds with similar chemical properties and the same functional group, differing from the successive member by $$-CH_2$$.

When we observe in $$(I)$$, molecules differ by $$-CH_2$$
When we observe in $$(II)$$, molecules differ by $$-C_2H_4$$
When we observe in $$(III)$$, molecules differ by $$-C_3H_6$$

All these molecules differ by a multiple of $$-CH_2$$ and have the same functional group, hence all these molecules belong to the same homologous series.
Question 3
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Which of the following does not belong to the same homologous series ?

A
$$CH_{4}$$

B
$$C_{2}H_{6}$$

C
$$C_{3}H_{8}$$

D
$$C_{4}H_{8}$$

Solution

A, B & C are all saturated carbon compounds with the general formula: $$C_{n}H_{2n+2}$$, whereas $$C_{4}H_{8}$$ is an alkene with general formula $$C_{n}H_{2n}$$

Option D is correct.
Question 4
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To name carbon compounds that have the aldehyde functional group, which of these is applicable?

A
Prefix - al

B
Suffix - al

C
Prefix - ol

D
Suffix - ol
Solution
- To name aldehydes, the suffix 'al' is used. For example: Propanal.
- 'ol' is the suffix used for alcohols. For example: Ethanol.
Question 5
1 / -0

In which of the following compounds maximum heat is liberated on combustion of one mole of the compound ?

A
Hydrogen

B
Methane

C
Ethane

D
Butane

Solution

The heat liberated on combustion for a hydrocarbon depends on the number of carbon atoms. As the number of carbon atoms increases, the heat liberated during combustion also increases.
Butane has the highest number of carbon atoms and is the biggest alkane among the given options. Therefore maximum heat is liberated on its combustion. Hence option D is correct.
Question 6
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All homologues have similar but graded:

A
solubility

B
melting point

C
boiling point

D
All of the above

Solution

Organic compounds that are part of the same homologous series generally have similar chemical properties as each other, due to the presence of the same functional grup in the molecules of all compounds in the series.
But they graded in physical properties, like solubility, melting, and boiling point of homologous series register a gradual changes. They increases as one move from lower to the higher series of member. Thus all homologues have similar but graded physical properties.
Question 7
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Formula of soap is:

A
$$C_{16}H_{32}COO Na$$

B
$$C_{17}H_{35}COO Na$$

C
$$C_{17}H_{33}COO Na$$

D
$$C_{17}H_{36}COO Na$$

Solution

Solution:- (B) $${C}_{17}{H}_{35}COONa$$
Soaps are sodium or potassium salts of long-chain carboxylic acids.
The formula for soap is $${C}_{17}{H}_{35}COONa$$.
Question 8
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Which of the following is a primary suffix?

A
-ane

B
-ene

C
-yne

D
all of these

Solution

A primary suffix indicates the degree of saturation or unsaturation in carbon compounds. Example: For carbon atoms linked by a single covalent bond, suffix: ane, for carbon atoms linked by a double bond, suffix: ene, for carbon atoms linked by a triple bond, suffix: yne is used.
Question 9
1 / -0

The fuel used in a steam engine is:

A
Water

B
Carbon dioxide

C
Carbon monoxide

D
Coal
Solution
Correct option: $$D$$

Explanation:
- Steam engine as the name suggests it is the engine that works on steam.
- The force produced by steam is used in the working of the steam engine.
- Steam is produced by burning coal.
- Coal is used to generate steam because as it has a high calorific value and easy to use.
Question 10
1 / -0

A carbon microphone is used in a

A
dynamo

B
telephone

C
transformer

D
None of these

Solution

A carbon microphone is typically used in a telephone.

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Carbon and its Compounds Test - 16

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Carbon and its Compounds Test - 16

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Question 1

$$CH_{3}COONa + NaOH \xrightarrow{CaO} CH_{4} + Na_{2}CO_{3}$$

$$CH_{3}COOH + C_{2}H_{5}OH \xrightarrow{H_{2}SO_{4}} CH_{3} COOC_{2}H_{5} +H_{2}O$$

$$2CH_{3}COOH + 2Na \rightarrow 2CH_{3} COONa + H_{2}$$

$$CH_{3}COOC_{2}H_{5} + NaOH \rightarrow CH_{3} COONa + C_{2} H_{5}OH$$

Solution

Question 2

(III) only

(II) only

(I) only

All of these

Solution

Question 3

$$CH_{4}$$

$$C_{2}H_{6}$$

$$C_{3}H_{8}$$

$$C_{4}H_{8}$$

Solution

Question 4

Prefix - al

Suffix - al

Prefix - ol

Suffix - ol

Solution

Question 5

Hydrogen

Methane

Ethane

Butane

Solution

Question 6

solubility

melting point

boiling point

All of the above

Solution

Question 7

$$C_{16}H_{32}COO Na$$

$$C_{17}H_{35}COO Na$$

$$C_{17}H_{33}COO Na$$

$$C_{17}H_{36}COO Na$$

Solution

Question 8

-ane

-ene

-yne

all of these

Solution

Question 9

Water

Carbon dioxide

Carbon monoxide

Coal

Solution

Question 10

dynamo

telephone

transformer

None of these

Solution

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