Alkanes questions

What is the IUPAC name of the opposite compound?

1. A 1-methylbutane.
2. B 1,3-methylpropane.
3. C 1,3-dimethylpropane.
4. D normal pentane.

From the opposite structural formulas:
Which of the following represents normal butane?

1. A (2) only.
2. B (3) only.
3. C (1) , (2).
4. D (2) , (3).

Any two successive members of the alkane series ..........

1. A differ in the general formula.
2. B differ in the molar mass.
3. C have the same density.
4. D have the same chemical formula.

What is the molecular formula of the alkane whose molar mass is greater than the molar mass of another compound in the same series by 56?
[C = 12 , H = 1]

1. A C₄H₁₀
2. B C₅H₁₀
3. C C₆H₁₄
4. D C₆H₁₂

The members of one homologous series have the same ..........

1. A chemical formula.
2. B general formula.
3. C physical properties.
4. D structural formula.

The members of the alkane series have all of the following in common, except ..........

1. A that they are isomers of each other.
2. B that they have similar chemical properties.
3. C that they follow a general molecular formula.
4. D that the difference in molar mass between any two successive compounds is 14

Isomerism in alkanes starts to appear with the compound ..........

1. A methane.
2. B ethane.
3. C propane.
4. D butane.

Butane differs from methylpropane in ..........

1. A the homologous series.
2. B the general formula.
3. C the molecular formula.
4. D the structural formula.

What is the general formula of alkyl halides?

1. A CₙH₂ₙ₊₁X
2. B CₙH₂ₙ₊₂X
3. C CₙHₙ₊₁X
4. D CₙH₂ₙX

Which of the following is the IUPAC name of the compound that contains (4) methyl groups?

1. A normal hexane.
2. B 2,3-dimethylbutane.
3. C 2-methylpentane.
4. D tetramethylbutane.

What is the number of methyl groups in the branched alkane whose molar mass is (58 g/mol)?
[C = 12 , H = 1]

1. A 1
2. B 2
3. C 3
4. D 4

What is the number of methylene groups in the compound 3-ethylpentane?

1. A 2
2. B 3
3. C 4
4. D 5

What is the IUPAC name of the opposite compound?

1. A pentane.
2. B 3-methylbutane.
3. C 2-methylbutane.
4. D butane.

The opposite figure represents the carbon skeleton of a hydrocarbon.
What is the IUPAC name of this compound?

1. A 2,4-diethyl-3,6-dimethylheptane.
2. B 2,5-dimethyl-4,6-diethylheptane.
3. C 5-ethyl-3,4,7-trimethyloctane.
4. D 4-ethyl-2,5,6-trimethyloctane.

What is the IUPAC name of the opposite compound?

1. A 2,4-dimethylhexane.
2. B 3,5-dimethylhexane.
3. C 2-methyl-4-ethylpentane.
4. D 2-ethyl-4-methylpentane.

What is the IUPAC name of the opposite compound?
CH₃(CH₂)₂CH(CH₃)CH(CH₃)₂

1. A 2,3-dimethyloctane.
2. B 2,3-dimethylhexane.
3. C 4,5-dimethyloctane.
4. D 4,5-dimethylhexane.

The compound 2,2,3-trimethylhexane is represented by the chemical formula ..........

1. A CH₃C(CH₃)₂CH₂CH₂CH(CH₃)₂
2. B CH₃C(CH₃)₂CH₂CH(CH₃)CH₂CH₃
3. C CH₃C(CH₃)₂CH(CH₃)CH₂CH₂CH₃
4. D CH₃C(CH₃)₂CH₂C(CH₃)₂CH₃

From the opposite table:
(1) 2-methylbutane
(2) normal octane
(3) 2,2,3-trimethylbutane
(4) 2,2-dimethylpropane
Which two compounds have the same molar mass?

1. A (1) , (2).
2. B (1) , (4).
3. C (2) , (3).
4. D (3) , (4).

Here are four structural formulas:
Which two formulas are named 2,2,4-trimethylpentane?

1. A (1) , (3).
2. B (1) , (4).
3. C (2) , (3).
4. D (2) , (4).

Which of the following is the IUPAC name of the compound that contains no methylene groups?

1. A normal hexane.
2. B 2,3-dimethylbutane.
3. C 2-methylpentane.
4. D 2,2-dimethylbutane.

An alkane contains 5 methyl groups and 2 methylene groups.
What is the IUPAC name of this compound?

1. A 2,3,4-trimethylhexane.
2. B 2,2,4-trimethylhexane.
3. C 2,2,3,4-tetramethylpentane.
4. D 2,3,3,4-tetramethylpentane.

A paraffin compound has (16) sigma bonds in its molecule.
What is the IUPAC name of an isomer of it that contains no methylene groups?

1. A 2-methylpropane.
2. B dimethylpropane.
3. C ethane.
4. D 2,3-dimethylbutane.

What is the IUPAC name of the opposite compound?
CH₃–CH₂–CH₂–CH₂–CH₂Cl

1. A pentyl chloride.
2. B hexane.
3. C 5-chloropentane.
4. D 1-chloropentane.

What is the IUPAC name of the opposite compound?

1. A 2-methyl-2-chlorobutane.
2. B 2-chloro-2-methylbutane.
3. C 3-methyl-3-chlorobutane.
4. D 3-chloro-3-methylbutane.

What is the IUPAC name of the opposite compound?

1. A 3-bromo-2-methylpentane.
2. B 2-methyl-3-bromopentane.
3. C 3-bromo-2-methylhexane.
4. D 2-methyl-3-bromohexane.

What is the IUPAC name of the opposite compound?

1. A 2-chloro-2-fluorobutane.
2. B 2-fluoro-3-chlorobutane.
3. C 3-fluoro-2-chlorobutane.
4. D 2-chloro-3-fluorobutane.

What is the IUPAC name of the opposite compound?

1. A 1,2-dichloro-1,2-dimethylpropane.
2. B 2,3-dichloro-2,3-dimethylpropane.
3. C 2,3-dichloro-2-methylbutane.
4. D 2,3-dichloro-3-methylbutane.

What is the IUPAC name of the opposite compound?

1. A 3,4-dichloro-2-fluorohexane.
2. B 3,4-dichloro-5-fluorohexane.
3. C 2-fluoro-3,4-dichlorohexane.
4. D 2,3-dichloro-2-fluoro-1-methylpentane.

What is the IUPAC name of the opposite compound?

1. A 2,3-dibromo-2-fluoropropane.
2. B 2-fluoro-2,3-dibromopropane.
3. C 1,2-dibromo-2-fluoropropane.
4. D 2-fluoro-1,2-dibromopropane.

What is the structural formula of the compound 5-chloro-2,2-dimethylhexane?

1. A A
2. B B
3. C C
4. D D

What is the number of isomers of the molecular formula C₃H₆Cl₂?

1. A 2
2. B 3
3. C 4
4. D 5

All of the following are correct names according to the IUPAC system, except ..........

1. A 3-chloro-2,2-dimethylbutane.
2. B 2,3-dimethylpentane.
3. C 2-chloro-1,1-dimethylpropane.
4. D 2-bromo-2-chlorohexane.

Which of the following is the correct IUPAC name of an organic compound?

1. A 2-chloro-3-bromopentane.
2. B 3-bromo-2-chloropentane.
3. C 4-bromo-2-chloropentane.
4. D 2-chloro-4-bromopentane.

What is the number of isomers of the chemical formula C₂H₃F₃?

1. A 1
2. B 2
3. C 3
4. D 4

Isomers of saturated hydrocarbons are formed when ..........

1. A the number of carbon atoms is changed.
2. B the number of hydrogen atoms is changed.
3. C branches are formed in the chain of carbon atoms.
4. D double bonds are formed.

The compound 2,2-dimethylbutane is an isomer of the compound ..........

1. A 2-methylbutane.
2. B 2,2-dimethylpentane.
3. C 2-methylpentane.
4. D 2,2-dimethylpropane.

What is the number of isomers of the molecular formula C₂H₃Cl₂Br?

1. A 2
2. B 3
3. C 4
4. D 5

What is the number of isomers of the molecular formula C₃H₅Br₃?

1. A 2
2. B 3
3. C 4
4. D 5

What is the number of possible isomers when a hydrogen atom in a molecule of 2,2-dimethylbutane is replaced by one chlorine atom (without changing the arrangement of the carbon skeleton)?

1. A 2
2. B 3
3. C 4
4. D 5

What is the number of isomers of the molecular formula C₆H₁₄?

1. A 4
2. B 5
3. C 6
4. D 7

A hydrocarbon has the molecular formula C₆H₁₄
What is the number of its isomers that contain 3 methyl groups, and what is the number of methylene groups in each of these isomers?

1. A 2 isomers / 3 methylene groups.
2. B 2 isomers / 2 methylene groups.
3. C 3 isomers / 2 methylene groups.
4. D 3 isomers / 3 methylene groups.

The compound C₇H₁₆ belongs to one of the homologous series:
(1) What is the molecular formula of the first member of this series?
(2) What is the type of bonds between the atoms of this compound?

Draw the possible isomers of the molecular formula C₄H₉Cl

Explain: the compound CH₃CHBrCH₂CH(CH₃)CH₃ is named 2-bromo-4-methylpentane, not 2-methyl-4-bromopentane.

What is the name and the molecular formula of the alkane - unbranched - of which the compound 3-ethyl-2-methylpentane is one of the isomers?

A saturated, non-cyclic aliphatic hydrocarbon is made of 14 atoms:
(1) What is the number of carbon atoms and hydrogen atoms in it?
(2) What are its possible structural formulas? Name each of them.

The molecular formula C₅H₁₂ represents three isomers.
Draw the structural formula of each of them, and name them according to the IUPAC system.

Among the isomers of hexane are two compounds whose longest continuous chain is made of 4 carbon atoms.
Draw the structural formula of these two isomers, and name them according to the IUPAC system.

Three alkanes differ in their number of isomers:
Alkane (X): 35 isomers. Alkane (Y): 18 isomers. Alkane (Z): 75 isomers.
Choose for each of these alkanes its suitable name from the following, and explain.
Octane. Decane. Nonane.

Write the IUPAC name of each of the following two compounds:

Write the IUPAC name of each of the following two compounds, in which each point of the skeleton represents a carbon atom:

Two alkane isomers have a molar mass of 58 g/mol. Draw the structural formula of each of them, and write the IUPAC name of each.
[C = 12 , H = 1]

Draw the structural formula and write the molecular formula of each of:
(1) 3-chloro-2-methylpentane.
(2) an alkane made of 5 carbon atoms that has no methylene groups.

Draw the structural formula of each of the following two compounds, then write the correct name of each according to the IUPAC system:
(1) 4-bromobutane.
(2) 3-methylbutane.

An alkane has the molecular formula C₆H₁₄ and contains four methyl groups and no methylene groups. (Sample exam 2026)
Which of the following is the IUPAC name of this compound?

1. A 2,2-dimethylbutane.
2. B 3,3-dimethylbutane.
3. C 2,3-dimethylbutane.
4. D 1,4-dimethylbutane.

From the names of the following compounds: (2nd session 2024)
(A): 2-ethyl-3-methylbutane.
(B): 3,4,4,5-tetramethyloctane.
Which of the following statements is correct?

1. A Name (A) is correct, (B) is wrong.
2. B Name (A) is wrong, (B) is correct.
3. C Name (A) is wrong, (B) is wrong.
4. D Name (A) is correct, (B) is correct.

In the formula: (Trial exam / June 2021)
After rewriting its correct structural formula without changing the molecular formula, it represents a(n) .......... compound.

1. A open-chain aliphatic
2. B unsaturated
3. C alkene
4. D branched alkene

One of the following compounds has only three isomers .......... (Trial exam / May 2021)

1. A propane.
2. B pentane.
3. C hexane.
4. D butane.

The compounds that can be similar in physical state and chemical properties are .......... (2nd session 2021)

1. A C₁₈H₃₈ , C₈H₁₈
2. B C₁₈H₃₈ , C₂₀H₄₂
3. C C₈H₁₆ , C₃H₄
4. D C₁₆H₃₂ , C₃H₆

The opposite compound: (CH₃)₂C(C₆H₅)CH₂CH(CH₃)₂ (1st session 2024)
Which of the following choices is the name of the compound according to the IUPAC system?

1. A 2,4-dimethyl-4-phenylpentane.
2. B 1,1,3,3-tetramethyl-1-phenylpropane.
3. C 2,4-dimethyl-2-phenylpentane.
4. D 2,4,4-trimethyldecane.