Question

1.

What is the IUPAC name for the compound shown below? The name should have the format alkanamine. What is the IUPAC name for the compound shown below?

2.

3.

4.

Answer 1

General guidance

Concepts and reason

IUPAC stands for international union of pure and applied chemistry. IUPAC has given a nomenclature to name the organic compounds. The IUPAC name consists of three parts: root name, prefix and suffix.

Fundamentals

The three parts of an IUPAC name are root name, prefix and suffix.

The longest chain gives the root name.

Prefix gives the position and name of the substitutions present on longest chain.

Suffix gives the functional group present in the structure.

Step-by-step

Step 1 of 12

1.

The given structure of the compound is shown below.

Root name is ethan.

Explanation | Common mistakes | Hint for next step

The longest chain has two carbon atoms. So, the root name for the given structure is ethan. Select the longest chain such that, the substituents have lowest numbers.

Step 2 of 12

Methyl group is attached to the nitrogen atom.

The prefix is N-methyl

One methyl group is attached to the nitrogen atom. So, the prefix is N-methyl.

Step 3 of 12

The suffix is amine

Thus, the IUPAC name of the given structure is N-methylethanamine

Explanation

The functional group is amine. So, that the suffix is amine

[Hint for the next step]

Select the longest chain in the given structure.

Step 4 of 12

2.

The given structure of the compound is shown below.

Root name is cyclopent.

Explanation | Common mistakes | Hint for next step

The longest chain has five carbon atoms and it is in cyclic form. So, the root name for the given structure is cyclopent. Select the longest chain such that, the substituents have lowest numbers.

Step 5 of 12

Two methyl groups are substituted at C-1 and C-2 carbons.

The prefix is 1,2-dimethyl

Two methyl groups are substituted at C-1 and C-2 carbons. So, the prefix is 1,2-dimethyl.

Step 6 of 12

The suffix is ane

Thus, the IUPAC name of the given structure is 1,2-dimethylcyclopentane

Explanation

The functional group is alkane. So, that the suffix is ane

[Hint for the next step]

Select the longest chain in the given structure.

Step 7 of 12

3.

The given structure of the compound is shown below.

Root name is pent.

Explanation | Common mistakes | Hint for next step

The longest chain has five carbon atoms. So, the root name for the given structure is pent. Select the longest chain such that, the substituents have lowest numbers.

Step 8 of 12

Two methyl groups are substituted at C-2 carbons and one ethyl groups is substituted at C-3 carbon.

The prefix is 3-ethyl-2,2-dimethyl

Explanation

Two methyl groups are substituted at C-2 carbon and one ethyl groups is substituted at C-3 carbon. So, the prefix is 3-ethyl-2,2-dimethyl.

[Common mistake]

Make sure that the substituents are named in an alphabetical order.

Step 9 of 12

The suffix is ane

Thus, the IUPAC name of the given structure is 3-ethyl-2,2-dimethylpentane

Explanation

The functional group is alkane. So, that the suffix is ane

[Hint for the next step]

Select the longest chain in the given structure.

Step 10 of 12

4.

The given structure of the compound is shown below.

Root name is cyclohexan.

Explanation | Common mistakes | Hint for next step

The longest chain has six carbon atoms and it is in cyclic form. So, the root name for the given structure is cyclohexan. Select the longest chain such that, the substituents have lowest numbers.

Step 11 of 12

No substituents are present.

The prefix is absent

Explanation

No substituents are present. So, the prefix is absent.

Step 12 of 12

The suffix is ol

Thus, the IUPAC name of the given structure is cyclohexanol

Explanation

The functional group is alcohol. So, that the suffix is ol

Answer

Thus, the IUPAC name of the given structure is N-methylethanamine

Thus, the IUPAC name of the given structure is 1,2-dimethylcyclopentane

Thus, the IUPAC name of the given structure is 3-ethyl-2,2-dimethylpentane

Thus, the IUPAC name of the given structure is cyclohexanol

Answer only

Thus, the IUPAC name of the given structure is N-methylethanamine

Thus, the IUPAC name of the given structure is 1,2-dimethylcyclopentane

Thus, the IUPAC name of the given structure is 3-ethyl-2,2-dimethylpentane

Thus, the IUPAC name of the given structure is cyclohexanol