Give the IUPAC names of the following alkanes

The ethyl group is at position 3. * Name: 3-ethylpentane

• b) CH₃-C (CH₃)₂-CH (CH₃)-CH₃

Numbering from the left gives methyl groups at positions 2, 2, and 4. * Name: 2,2,4-trimethylpentane

• c) C₂H₅-CH (CH₃)-CH₂-CH (CH₃)₂

Numbering from the right gives methyl groups at positions 2 and 4. * Name: 2,4-dimethylhexane

• d) (CH₃)₂-CH-CH₂-CH₂-CH (CH₃)₂

Numbering from either end gives methyl groups at positions 2 and 5. * Name: 2,5-dimethylhexane

• e) CH₃-CH₂-CHCI-C(CH₃)₂-CHBrH₂

The expanded formula is CH₃-CH₂-CHCl-C(CH₃)₂-CH₂Br.

Numbering from the right gives 1-bromo, 2,2-dimethyl, 3-chloro.

bromo, chloro, dimethyl. * Name: 1-bromo-3-chloro-2,2-dimethylpentane

• f)

*   Name: **Isopropylcyclohexane**

• g)

Ethyl is at position 1, and methyl is at position 2. * Name: 1-ethyl-2-methylcyclohexane

• h)

*   Name: **Pentylcyclohexane**

2. Write the structural formula of the following

• a) 2,3-dimethylbutane

  $$\text{CH}_3\text{-CH(CH}_3\text{)-CH(CH}_3\text{)-CH}_3$$

• b) 2,2,4-trimethylpentane

  $$\text{CH}_3\text{-C(CH}_3\text{)}_2\text{-CH}_2\text{-CH(CH}_3\text{)-CH}_3$$

• c) 2-chloro-2,3-dimethylpentane

  $$\text{CH}_3\text{-CCl(CH}_3\text{)-CH(CH}_3\text{)-CH}_2\text{-CH}_3$$

• d) 2,3-dibromo-1-chloro-3-methylhexane

  $$\text{CH}_2\text{Cl-CHBr-CBr(CH}_3\text{)-CH}_2\text{-CH}_2\text{-CH}_3$$

• e) 2-chloro-3,3-dimethylbutane

  $$\text{CH}_3\text{-CHCl-C(CH}_3\text{)}_2\text{-CH}_3$$

• f) 2-chloro-2,3-dimethylpentane

  $$\text{CH}_3\text{-CCl(CH}_3\text{)-CH(CH}_3\text{)-CH}_2\text{-CH}_3$$

EXERCISE

1. Write the IUPAC name of the following compounds:

• a) (CH₃)₂CHCH=CHCH₂CH₃

The double bond is between C3 and C4. The methyl group is at C2. * Name: 2-methylhex-3-ene

• b)

Prioritize the double bond if there's a tie. Number