Carbon and its Compounds Test

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Carbon and its Compounds Test - 31

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Weekly Quiz Competition

Question 1
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Which of the following is a characteristic of homologous series?

A
All the members can be represented by same general formula

B
All the members have same functional group

C
Both a and b

D
All the members show different chemical properties

Solution

All the members can be represented by same general formula. The molecular formulae of two successive members differ by $$C{H}_{2}$$ group or by $$14 u$$. All the members have same functional group. All the members show similar chemical properties.
Question 2
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Due to its small size, carbon atom can form:

A
multiple bonds

B
metallic bond

C
no bond

D
ionic bond

Solution

Due to its small size, the carbon atom can form multiple bonds, i.e., double and triple bonds with not only carbon but with atoms of other elements like oxygen, nitrogen, etc.
The formation of these multiple bonds gives rise to a variety in the carbon compounds.
Hence, the correct option is $$\text{A}$$.
Question 3
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The longest chain has eight carbon atoms and thus the name of parent alkane compound is :

A
octane

B
heptane

C
nonane

D
decane

Solution

The term heptane is used for alkane with seven carbon atoms, nonane for alkane with nine carbon atoms, decane is for alkane with ten carbon atoms, and octane for alkane with eight carbon atoms. In the given question, the longest chain has eight carbon atoms and, so the name of the parent compound would be octane. Hence option A is correct.
Question 4
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Which of the following is alkane?

A
$$C_{10}H_{22}$$

B
$$C_{10}H_{20}$$

C
$$C_{9}H_{18}$$

D
$$C_8H_8$$

Solution

Decane is an alkane hydrocarbon, with the chemical formula $$C_{10}H_{22}$$.
Hence, option $$\text{A}$$ is correct.
Question 5
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Why does ethane have a higher boiling point than methane?

A
Difference in size

B
Functional group

C
Difference in shape

D
None of above

Solution

Ethane have a higher boiling point than methane because molecules of ethane ($$C_2H_6$$) have more Van der Waals forces (intermolecular forces) with neighboring molecules than methane ($$CH_4$$) due to the greater number of atoms present in the molecule of ethane compared to methane.
Question 6
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Name the parent chain.

A
Heptane

B
Nonane

C
Hexane

D
Octane

Solution

The longest carbon chain is also known as the parent chain. The given structure has $$9$$ carbon atoms in the longest chain. Hence, the parent chain is nonane.
Question 7
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What is a homologation reaction?

A
Conversion of one member of a homologous series to the other compounds.

B
Breakdown of compounds in a homologous series.

C
Conversion of one member of a homologous series to the next member of homologous series.

D
None of above

Solution

A homologation reaction is a chemical process that converts one member of a homologous series to the next member of the homologous series.
Question 8
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If C = 4, then the alkyne is :

A
butyne

B
butene

C
propyne

D
propene

Solution

If C = 4, then, $$C_nH_{2n-2} = C_4H_{2 \times 4-2} = C_4H_6$$. The name of this compound is butyne.
Question 9
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The trends in physical properties of compounds within a homologous series are due to:

A
change in size

B
change in weight

C
functional group

D
both A and B

Solution

The trends in physical properties of compounds within a homologous series are primarily due to the progression of sizes and therefore, weights of the molecules that form the homologous series.
Question 10
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Number of carbon atoms in the longest chain is 3. A methyl group is present at carbon number 2. So, IUPAC name is___________.

A
2-ethyl propane

B
butane

C
2-methyl propane

D
2-methyl butane

Solution

Number of carbon atoms in the longest chain is 3, word root will be "prop" .
Methyl group is present at carbon number 2 of the parent chain. So, IUPAC name is 2-methyl propane.

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Re-Attempt Weekly Quiz Competition

Carbon and its Compounds Test - 31

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Carbon and its Compounds Test - 31

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Question 1

All the members can be represented by same general formula

All the members have same functional group

Both a and b

All the members show different chemical properties

Solution

Question 2

multiple bonds

metallic bond

no bond

ionic bond

Solution

Question 3

octane

heptane

nonane

decane

Solution

Question 4

$$C_{10}H_{22}$$

$$C_{10}H_{20}$$

$$C_{9}H_{18}$$

$$C_8H_8$$

Solution

Question 5

Difference in size

Functional group

Difference in shape

None of above

Solution

Question 6

Heptane

Nonane

Hexane

Octane

Solution

Question 7

Conversion of one member of a homologous series to the other compounds.

Breakdown of compounds in a homologous series.

Conversion of one member of a homologous series to the next member of homologous series.

None of above

Solution

Question 8

butyne

butene

propyne

propene

Solution

Question 9

change in size

change in weight

functional group

both A and B

Solution

Question 10

2-ethyl propane

butane

2-methyl propane

2-methyl butane

Solution

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