Organic Chemistry Test

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Organic Chemistry Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is a saturated hydrocarbon?

A
CH₃CH₂CH₂CH₃

B
CH₃CHCHCH₃

C
CH₂CH₂

D
CH₃CHCH₂

Solution

Butane (CH₃CH₂CH₂CH₃) is an alkane, which is a saturated hydrocarbon.
Question 2
1 / -0

If an organic compound has C₁₀H₂₀as its molecular formula, its empirical formula is

A
C₂H₂

B
CH₂

C
C₁₀H₁₀

D
C₅H₁₀

Solution

If an organic compound has C₁₀H₂₀ as its molecular formula, its empirical formula is CH₂.
Question 3
1 / -0

Which of the following correctly represents the electron dot structure of ethene?

A

B

C

D

Solution

The correct electron dot structure of ethane is
Question 4
1 / -0

Which gas is used for artificial ripening of green fruits?

A
Acetylene

B
Ethane

C
Carbon dioxide

D
Hydrogen

Solution

Calcium carbide is used for artificially ripening fruits. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is quite similar in its effects to the natural ripening agent, ethylene. Acetylene acts like ethylene and accelerates the ripening process.
So, acetylene gas is used for artificial ripening of green fruits.
Question 5
1 / -0

Water decomposes calcium carbide with the liberation of

A
ethane

B
methane

C
acetylene

D
ethylene

Solution

Water decomposes calcium carbide with the liberation of acetylene as follows:
CaC₂ + 2 H₂O → C2H₂ + Ca(OH)₂
Question 6
1 / -0

Which of the following gases is known as illuminating gas?

A
Ethane

B
Ethene

C
Ethyne

D
None of these

Solution

Gas lighting or illuminating gas is production of artificial light from combustion of a gaseous fuel, such as hydrogen, methane, carbon monoxide, propane, butane, acetylene, ethylene, or natural gas. Acetylene (systematic name: ethyne) is the chemical compound with the formula C₂H₂. It is a hydrocarbon and the simplest alkyne.
Question 7
1 / -0

Which of the following compounds does not exist?

A
Ethyne

B
Ethane

C
Methane

D
Methyne

Solution

Methane (CH₄) is an alkane and there is only one carbon atom and so no chance to form double and triple C-C bonds. Thus, methyne and methane compounds do not exist.
Question 8
1 / -0

Alicyclic compounds are

A
the same as aromatic compounds

B
the same as open chain compounds

C
different from aromatic and open chain compounds

D
none of these

Solution

Alicyclic compounds are different from aromatic and open chain compounds.
Question 9
1 / -0

Which of the following salts are considered soft soaps?

A
Calcium salts of higher fatty acids.

B
Magnesium salts of higher fatty acids.

C
Potassium salts of higher fatty acids.

D
Sodium salts of higher fatty acids.

Solution

Potassium salts of higher fatty acids are considered as soft soaps.
Question 10
1 / -0

What is the chemical name of the following structure?

A
Hexene

B
Cyclohexane

C
Cycloctane

D
Hexyne

Solution

The given compound is cyclohexane.
Question 11
1 / -0

The correct molecular formula of butyl alcohol is

A
CH₃CH₂CH₂CH₂OH

B

C

D

Solution

Butyl alcohol is the common name of butan-1-ol and has the molecular formula: CH₃CH₂CH₂CH₂OH.
Question 12
1 / -0

What is added to industrial ethanol to make it unsuitable for human consumption?

A
Benzene

B
Chlorine

C
Methane

D
Methanol

Solution

Methanol is used to denature industrial ethanol, i.e. to add the poisonous substance to ethanol to make it unsuitable for human consumption.
Question 13
1 / -0

Soap helps in washing by

A
removing the hardness of water

B
increasing the density of water

C
decreasing the surface tension of water

D
none of the above

Solution

None of the above given options are correct for washing action of soaps.
Question 14
1 / -0

Why is ethanoic acid called glacial acetic acid?

A
Because it gets denatured easily.

B
Because it freezes during winter in cold climates.

C
Because it oxidises when it reacts with moisture.

D
Because it is used as a preservative.

Solution

Ethanoic acid is called glacial acetic acid because it freezes during winter in cold climates.
Question 15
1 / -0

Which of the following functional groups is present in

A
Aldehyde

B
Ketone

C
Acohol

D
Halogen

Solution

The functional group which is present in the given structure is aldehyde.
Question 16
1 / -0

Which of the following is the molecular name of the compound 'H₃CCOCH₂CH₃'?

A
Propanoic acid

B
Butanone

C
Butanal

D
Propanal

Solution

The molecular name of the compound 'H₃CCOCH₂CH₃' is butanone.
Question 17
1 / -0

Which of the following is the functional group of aldehydes?

A
– COOH

B

C

D
– OH

Solution

The functional group of aldehydes is (-CHO).
Question 18
1 / -0

Vinegar is an aqueous solution of

A
oxalic acid

B
citiric acid

C
acetic acid

D
hydrochloric acid

Solution

Vinegar is no less than 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
Question 19
1 / -0

Which of the following is incorrect about esters?

A
It is used in making perfumes.

B
It is used as flavouring agent.

C
It is used in preparation of soap.

D
It is used as an antiseptic.

Solution

Esters are not used as an antiseptic.
Question 20
1 / -0

Which of the following is a carboxylic acid?

A
H₃C–CH₂ – CH₂ – Cl

B
H₃C – CH₂ – CHO

C
H₃C – CO – CH₃

D
H₃C – CH₂ – COOH

Solution

H₃C – CH₂ – COOH is a carboxylic acid.