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Question (11)

QN0035982

Carbon atoms in a molecule are joined as C—C—C—C with only single bonds. If the remaining valencies are satisfied by hydrogen, which molecular formula results?

(A) C₄H₆
(B) C₄H₈
(C) C₄H₁₀
(D) C₄H₁₂

Correct Answer: C

Explanation:

Four carbon atoms connected by single bonds form butane, whose formula is C₄H₁₀.

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Question (12)

QN0035983

Ethane has formula C₂H₆. If one additional carbon atom is introduced into the same saturated straight-chain series, what is the expected formula?

(A) C₃H₆
(B) C₃H₈
(C) C₃H₁₀
(D) C₃H₁₂

Correct Answer: B

Explanation:

The saturated hydrocarbon series progresses CH₄, C₂H₆, C₃H₈, C₄H₁₀. Thus the next member is C₃H₈.

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Question (13)

QN0035984

The molecular mass of methane is 16 u. What is the molecular mass of ethane using C = 12 u and H = 1 u?

(A) 26 u
(B) 28 u
(C) 30 u
(D) 32 u

Correct Answer: C

Explanation:

Ethane is C₂H₆. Molecular mass = 2(12) + 6(1) = 30 u.

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Question (14)

QN0035985

Which pair represents two successive members of a homologous series?

(A) CH₄ and C₂H₄
(B) C₂H₆ and C₃H₈
(C) C₂H₄ and C₃H₈
(D) C₃H₈ and C₄H₈

Correct Answer: B

Explanation:

Successive members of a homologous series differ by a CH₂ unit. C₂H₆ → C₃H₈ differs by CH₂.

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Question (15)

QN0035986

Two compounds have the same molecular formula C₄H₁₀ but different carbon skeletons. What are they called?

(A) Homologues
(B) Isotopes
(C) Structural isomers
(D) Functional groups

Correct Answer: C

Explanation:

Compounds having the same molecular formula but different structures are called structural isomers.

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Question (16)

QN0035987

A student has C₄H₁₀ and C₅H₁₂. What is the difference in their molecular masses?

(A) 12 u
(B) 14 u
(C) 16 u
(D) 18 u

Correct Answer: B

Explanation:

C₄H₁₀ = 4(12)+10 = 58 u. C₅H₁₂ = 5(12)+12 = 72 u. Difference = 14 u.

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Question (17)

QN0035988

A hydrocarbon follows the general formula CₙH₂ₙ and contains three carbon atoms. Which formula is expected?

(A) C₃H₄
(B) C₃H₆
(C) C₃H₈
(D) C₃H₁₀

Correct Answer: B

Explanation:

For n = 3, H = 2n = 6. Therefore, the formula is C₃H₆.

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Question (18)

QN0035989

A hydrocarbon contains only carbon and hydrogen and has a triple bond. Into which class does it fall?

(A) Alkane
(B) Alkene
(C) Alkyne
(D) Alcohol

Correct Answer: C

Explanation:

Hydrocarbons containing one or more triple bonds are called alkynes.

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Question (19)

QN0035990

A compound has four carbon atoms and a ketone functional group. Which name is consistent with the nomenclature rules in the chapter?

(A) Butanol
(B) Butanal
(C) Butanone
(D) Butanoic acid

Correct Answer: C

Explanation:

A ketone uses the suffix “-one”; a four-carbon ketone is butanone.

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Question (20)

QN0035991

A three-carbon chain contains a triple bond. Which change should be made to the name “propane” according to the chapter's nomenclature rule?

(A) Replace “ane” with “ene”
(B) Replace “ane” with “yne”
(C) Add “ol”
(D) Add “al”

Correct Answer: B

Explanation:

A triple bond is indicated by replacing “ane” with “yne”, giving propyne.

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Question (11)

Carbon atoms in a molecule are joined as C—C—C—C with only single bonds. If the remaining valencies are satisfied by hydrogen, which molecular formula results?

Explanation:

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Question (12)

Ethane has formula C₂H₆. If one additional carbon atom is introduced into the same saturated straight-chain series, what is the expected formula?

Explanation:

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Question (13)

The molecular mass of methane is 16 u. What is the molecular mass of ethane using C = 12 u and H = 1 u?

Explanation:

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Question (14)

Which pair represents two successive members of a homologous series?

Explanation:

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Question (15)

Two compounds have the same molecular formula C₄H₁₀ but different carbon skeletons. What are they called?

Explanation:

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Question (16)

A student has C₄H₁₀ and C₅H₁₂. What is the difference in their molecular masses?

Explanation:

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Question (17)

A hydrocarbon follows the general formula CₙH₂ₙ and contains three carbon atoms. Which formula is expected?

Explanation:

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Question (18)

A hydrocarbon contains only carbon and hydrogen and has a triple bond. Into which class does it fall?

Explanation:

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Question (19)

A compound has four carbon atoms and a ketone functional group. Which name is consistent with the nomenclature rules in the chapter?

Explanation:

Link:

Question (20)

A three-carbon chain contains a triple bond. Which change should be made to the name “propane” according to the chapter's nomenclature rule?

Explanation:

Link:

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