Possible Structure Isomers of Primary Amines with Molecular Formula C5H13N

Primary amines are organic compounds that contain an amino group (-NH2) attached to a carbon atom that is bonded to two hydrogen atoms and one alkyl or aryl group. The molecular formula of primary amines with five carbon atoms is C5H13N. There are eight possible structure isomers of primary amines with this molecular formula, which can be explained as follows:

1. Pentan-1-amine
- The amino group is attached to the first carbon atom of the pentane chain.
- Molecular formula: CH3CH2CH2CH2CH2NH2

2. Pentan-2-amine
- The amino group is attached to the second carbon atom of the pentane chain.
- Molecular formula: CH3CH2CH(NH2)CH2CH3

3. Pentan-3-amine
- The amino group is attached to the third carbon atom of the pentane chain.
- Molecular formula: CH3CH(NH2)CH2CH2CH3

4. 2-Methylbutan-1-amine
- The amino group is attached to the first carbon atom of the 2-methylbutane chain.
- Molecular formula: CH3CH(CH3)CH(CH2NH2)CH3

5. 2-Methylbutan-2-amine
- The amino group is attached to the second carbon atom of the 2-methylbutane chain.
- Molecular formula: CH3CH(CH3)CH2CH(NH2)CH3

6. 3-Methylbutan-1-amine
- The amino group is attached to the first carbon atom of the 3-methylbutane chain.
- Molecular formula: CH3CH2CH(CH3)CH(NH2)CH3

7. 3-Methylbutan-2-amine
- The amino group is attached to the second carbon atom of the 3-methylbutane chain.
- Molecular formula: CH3CH(CH3)CH(CH2NH2)CH3

8. 2,2-Dimethylpropan-1-amine
- The amino group is attached to the first carbon atom of the 2,2-dimethylpropane chain.
- Molecular formula: (CH3)3CCH2NH2

Therefore, the correct answer is '8'.

The molecular formula of the primary amine will be C5H11NH2 , and we can arrange the alkyl part i.e., C5H11 into 8 parts so the answer will be 8.