Carbon and its Compounds Test

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Carbon and its Compounds Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

All members of a homologous series have the same :

A
chemical formula.

B
empirical formula.

C
boiling point.

D
melting point.

Solution

Homologous series differ by a $$CH_2$$ group. It has a mass of 14 units. They can be represented by a common general formula for alkanes, alkenes, alkynes, and other functional groups. They can thus, be represented by a common empirical formula.
For example alkanes has empirical formula $$C_nH_{2n+2}$$ and for alkenes it is $$C_nH_{2n}$$ etc.
Hence, option $$B$$ is correct.
Question 2
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All members of a homologous series differ by a:

A
methyl group

B
methylene group

C
methane group

D
None of these

Solution

Homologous series differ by a $$CH_2$$ group known as the methylene group.
Question 3
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What is not true about homologous series?

A
All members have similar chemical properties

B
They have identical physical properties

C
They can be represented by a general formula

D
None of the above
Solution
- Homologous series differ by a $$CH_2$$ group. They have similar chemical properties as they have a common functional group.
- They can be represented by a general formula for alkanes, alkenes, alkynes, and other functional groups.
- However, as the molecular mass increases in a homologous series, a gradation in physical properties is observed. So, they do not have identical physical properties.
Question 4
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The characteristic chemical reaction shown by alkanes is :

A
substitution reaction

B
addition reaction

C
subtraction reaction

D
none of these

Solution

The characteristic chemical reaction shown by alkanes is a substitution reaction. The H atom of alkanes is substituted with some other atom.

For example, when methane reacts with chlorine in presence of UV rays, it gives methyl chloride. H is replaced with Cl.

$$CH_4 + Cl_2 \xrightarrow { \text { U . V rays}} CH_3Cl + HCl$$

As alkane does not contain any double or triple bond so they do not undergo additional reactions.

Option A is correct.
Question 5
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Define homologous series.

A
Compound with same melting point

B
Compound with same molecular mass

C
Compounds with different general formula

D
Compounds with same functional group substitutes for hydrogen in a carbon chain

Solution

A homologous series is a series of compounds with the same general formula. But they have different melting points (physical properties) and different molecular masses. However, they have the same functional group substitutes for hydrogen in a carbon chain.
Example: $$CH_3OH, C_2H_5OH, C_3H_7OH$$
Question 6
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Addition reactions occur in :

A
saturated hydrocarbons

B
unsaturated hydrocarbons

C
both A and B

D
none of these

Solution

Addition reactions occur in unsaturated hydrocarbons.
A reactant molecule is added to carbon carbon multiple bond.
For example, when ethylene is heated with a molecule of bromine, 1,2-dibromo ethane is obtained.
A molecule of bromine is added across carbon carbon double bond.
$$CH_2 = CH_2 + Br-Br \xrightarrow {\Delta } Br-CH_2-CH_2-Br$$
Question 7
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What is the name of the compound shown in the figure?

A
Butene

B
Propyne

C
Propyne-2

D
Butyne

Solution

The parent chain consists of 3 carbon atoms, therefore, the root word is "prop". There is a triple bond in the chain, this is indicated by the suffix, yne. Also, the parent chain is numbered such that the multiple bond gets the lowest number.
So the correct name of the compound is prop-1-yne or propyne.
Question 8
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Which is the correct name for $$CH_3CH_2CH_2CH_2CH_2CONH_2$$ ?

A
Hexanamide

B
6-hexanamide

C
6-hexanamine

D
Pentanamide

Solution

The $$CONH_2$$ is an amide group. Longest chain consists of 6 carbon atoms. The correct name of the compound is hexanamide.
Question 9
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Carbon can form a maximum of _____ covalent bonds.

A
1

B
2

C
3

D
4

Solution

Carbon has four electrons in its outermost shell, therefore, it can form a maximum of four covalent bonds with other atoms or molecules.
Hence, the correct option is $$D$$.
Question 10
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What is the IUPAC name of the compound shown in the image?

A
1,1,1,1-tetra ethyl methane

B
2,2-dimethyl pentane

C
3,3-diethyl pentane

D
3,3-dimethyl butane

Solution

Longest chain consists of 5 carbon atoms with 2 ethyl groups connected at 3rd carbon atom. The name of the compound is 3,3 diethyl pentane.

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Carbon and its Compounds Test - 28

Result

Carbon and its Compounds Test - 28

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SHARING IS CARING

Question 1

chemical formula.

empirical formula.

boiling point.

melting point.

Solution

Question 2

methyl group

methylene group

methane group

None of these

Solution

Question 3

All members have similar chemical properties

They have identical physical properties

They can be represented by a general formula

None of the above

Solution

Question 4

substitution reaction

addition reaction

subtraction reaction

none of these

Solution

Question 5

Compound with same melting point

Compound with same molecular mass

Compounds with different general formula

Compounds with same functional group substitutes for hydrogen in a carbon chain

Solution

Question 6

saturated hydrocarbons

unsaturated hydrocarbons

both A and B

none of these

Solution

Question 7

Butene

Propyne

Propyne-2

Butyne

Solution

Question 8

Hexanamide

6-hexanamide

6-hexanamine

Pentanamide

Solution

Question 9

1

2

3

4

Solution

Question 10

1,1,1,1-tetra ethyl methane

2,2-dimethyl pentane

3,3-diethyl pentane

3,3-dimethyl butane

Solution

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