Hydrocarbons Test

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Hydrocarbons Test - 30

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Weekly Quiz Competition

Question 1
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For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH₂ (replacing n by 1 in C_nH_2n) known as methene but has a very short life. The first stable member of the alkene series is C₂H₄ known as ethylene (common) or ethene (IUPAC).
Q. The IUPAC name of CH₃—CH=CH—CH₃ is:

A
A. Propene

B
B. But-1-ene

C
C. But-2-ene

D
D. Buta-1, 3-diene

Solution
Question 2
1 / -0

For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH₂ (replacing n by 1 in C_nH_2n) known as methene but has a very short life. The first stable member of the alkene series is C₂H₄ known as ethylene (common) or ethene (IUPAC).
Q. The number of σ and π-bonds in C₂H₄ is ............... and ............. respectively.

A
A. 4σ and 1π

B
B. 5σ and 2π

C
C. 4σ and 2π

D
D. 5σ and 1π

Solution

Number of σ bonds = 5
Number of π bond = 1
Question 3
1 / -0

For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH₂ (replacing n by 1 in C_nH_2n) known as methene but has a very short life. The first stable member of the alkene series is C₂H₄ known as ethylene (common) or ethene (IUPAC).
Q. The correct statement/s for nomenclature of alkenes in the IUPAC system is/are:

A
A. The largest chain of carbon atoms is selected.

B
B. Numbering of the chain is done from the end which is nearer to the double bond.

C
C. The suffix ‘yne’ replaces ‘ane’ of alkanes.

D
D. All of the above.

Solution

(i) F or nomenclature of alkenes in IUPAC system. The longest chain of carbon atoms containing the double bond is selected.
(ii) Numbering of the chain is done from the end which is nearer to the double bond.
Question 4
1 / -0

For nomenclature of alkenes in the IUPAC system, the longest chain of carbon atoms containing the double bond is selected. Numbering of the chain is done from the end which is nearer to the double bond. The suffix ‘ene’ replaces ‘ane’ of alkanes. The first member of the alkene series is: CH₂ (replacing n by 1 in C_nH_2n) known as methene but has a very short life. The first stable member of the alkene series is C₂H₄ known as ethylene (common) or ethene (IUPAC).
Q. The general formula of alkenes is:

A
A. C_nH_2n+2

B
B. C_nH_2n

C
C. C_nH_2n–2

D
D. C_nH_2n+1OH

Solution

The general formula of alkenes is C_nH_2n (where n = 2, 3, 4, ...)
Question 5
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Alkanes are almost non-polar molecules because of the covalent nature of C—C and C—H bonds and due to very little difference of electronegativity between carbon and hydrogen atoms. They possess weak Van Der Waals forces. Due to the weak forces, the first four members C₁ to C₄ are gases, C₅ to C₁₇ are liquids and those containing 18 carbon atoms or more are solids at 298K. They are colourless and odourless. In alkanes, there is a steady increase in boiling point with the increase in molecular mass. This is due to the fact that the intermolecular Van Der Waals forces increase with increase of the molecular size or the surface area of the molecule. With the increase in branching, the boiling point of alkanes decreases. The given questions (i) to (iv) consist of an assertion (A) and reason (R) statement. Choose the appropriate answer.
Assertion: Alkanes are polar molecules.
Reason: C—C and C—H bonds in alkanes are covalent in nature.

A
A. A and R both are correct and R is the correct explanation of A.

B
B. A and R both are correct but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false but R is true.

Solution

Alkanes are non-polar molecules because of covalent nature of C—C and C—H bonds in alkanes.
Question 6
1 / -0

Alkanes are almost non-polar molecules because of the covalent nature of C—C and C—H bonds and due to very little difference of electronegativity between carbon and hydrogen atoms. They possess weak Van Der Waals forces. Due to the weak forces, the first four members C₁ to C₄ are gases, C₅ to C₁₇ are liquids and those containing 18 carbon atoms or more are solids at 298K. They are colourless and odourless. In alkanes, there is a steady increase in boiling point with the increase in molecular mass. This is due to the fact that the intermolecular Van Der Waals forces increase with increase of the molecular size or the surface area of the molecule. With the increase in branching, the boiling point of alkanes decreases. The given questions (i) to (iv) consist of an assertion (A) and reason (R) statement. Choose the appropriate answer.
Assertion: The boiling point of pentane is higher than butane.
Reason: The molecules of pentane possess lesser Van Der Waals forces than butane.

A
A. A and R both are correct and R is the correct explanation of A.

B
B. A and R both are correct but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false but R is true.

Solution

BP of pentane (C₅H₁₂) > BP of butane (C₄H₁₀). It is due to the fact that the molecules of pentane possess greater Van Der Waals forces than butane.
Question 7
1 / -0

Alkanes are almost non-polar molecules because of the covalent nature of C—C and C—H bonds and due to very little difference of electronegativity between carbon and hydrogen atoms. They possess weak Van Der Waals forces. Due to the weak forces, the first four members C₁ to C₄ are gases, C₅ to C₁₇ are liquids and those containing 18 carbon atoms or more are solids at 298K. They are colourless and odourless. In alkanes, there is a steady increase in boiling point with the increase in molecular mass. This is due to the fact that the intermolecular Van Der Waals forces increase with increase of the molecular size or the surface area of the molecule. With the increase in branching, the boiling point of alkanes decreases. The given questions (i) to (iv) consist of an assertion (A) and reason (R) statement. Choose the appropriate answer.
Assertion: Alkanes are hydrophobic in nature.
Reason: Alkanes are nonpolar molecules.

A
A. A and R both are correct and R is the correct explanation of A.

B
B. A and R both are correct but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false but R is true.

Solution

Alkanes are hydrophobic in nature as these are non-polar in nature.
Question 8
1 / -0

Alkanes are almost non-polar molecules because of the covalent nature of C—C and C—H bonds and due to very little difference of electronegativity between carbon and hydrogen atoms. They possess weak Van Der Waals forces. Due to the weak forces, the first four members C₁ to C₄ are gases, C₅ to C₁₇ are liquids and those containing 18 carbon atoms or more are solids at 298K. They are colourless and odourless. In alkanes, there is a steady increase in boiling point with the increase in molecular mass. This is due to the fact that the intermolecular Van Der Waals forces increase with increase of the molecular size or the surface area of the molecule. With the increase in branching, the boiling point of alkanes decreases. The given questions (i) to (iv) consist of an assertion (A) and reason (R) statement. Choose the appropriate answer.
Assertion: The first four members of alkanes are gases.
Reason: They possess weak Van Der Waals forces.

A
A. A and R both are correct and R is the correct explanation of A.

B
B. A and R both are correct but R is not the correct explanation of A.

C
C. A is true but R is false.

D
D. A is false but R is true.

Solution

The first four members (C₁ to C₄) of alkanes are gases due to presence of weak Van Der Waals forces in their molecules.

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Hydrocarbons Test - 30

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Hydrocarbons Test - 30

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Question 1

A. Propene

B. But-1-ene

C. But-2-ene

D. Buta-1, 3-diene

Solution

Question 2

A. 4σ and 1π

B. 5σ and 2π

C. 4σ and 2π

D. 5σ and 1π

Solution

Question 3

A. The largest chain of carbon atoms is selected.

B. Numbering of the chain is done from the end which is nearer to the double bond.

C. The suffix ‘yne’ replaces ‘ane’ of alkanes.

D. All of the above.

Solution

Question 4

A. CnH2n+2

B. CnH2n

C. CnH2n–2

D. CnH2n+1OH

Solution

Question 5

A. A and R both are correct and R is the correct explanation of A.

B. A and R both are correct but R is not the correct explanation of A.

C. A is true but R is false.

D. A is false but R is true.

Solution

Question 6

A. A and R both are correct and R is the correct explanation of A.

B. A and R both are correct but R is not the correct explanation of A.

C. A is true but R is false.

D. A is false but R is true.

Solution

Question 7

A. A and R both are correct and R is the correct explanation of A.

B. A and R both are correct but R is not the correct explanation of A.

C. A is true but R is false.

D. A is false but R is true.

Solution

Question 8

A. A and R both are correct and R is the correct explanation of A.

B. A and R both are correct but R is not the correct explanation of A.

C. A is true but R is false.

D. A is false but R is true.

Solution

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A. C_nH_2n+2

B. C_nH_2n

C. C_nH_2n–2

D. C_nH_2n+1OH