Let's break down the problem step-by-step: ## 1. **Identify the Given Molecule** The given molecule is: ``` CH3 | CH3-C-CH3 | CH3 ``` In condensed form: **C₄H₁₀** (butane isomers). However, the structure shown is: **(CH₃)₄C** or **2,2-dimethylpropane** (also known as neopentane). ## 2. **Determine the Molecular Formula** - Count carbons: 1 central + 4 methyls = **5 carbons** - Count hydrogens: Each CH₃ has 3 H; 4 × 3 = **12 hydrogens** So, molecular formula: **C₅H₁₂** ## 3. **Find Isomers of C₅H₁₂** There are three isomers of pentane: 1. **n-pentane**: CH₃CH₂CH₂CH₂CH₃ 2. **isopentane (2-methylbutane)**: (CH₃)₂CHCH₂CH₃ 3. **neopentane (2,2-dimethylpropane)**: (CH₃)₄C (the given structure) ## 4. **Choose an Isomer Different from the Given One** We need to draw a condensed structure **that is not neopentane**. Let's pick **isopentane (2-methylbutane)**. ### **Step-by-Step for 2-methylbutane:** 1. Draw a four-carbon chain: CH₃-CH₂-CH₂-CH₃ 2. Add a methyl (CH₃) group to carbon 2. So, the condensed structure is: **CH₃CH(CH₃)CH₂CH₃** ## 5. **Final Answer** ### **Condensed structure of an isomer of the given molecule:** ``` CH₃CH(CH₃)CH₂CH₃ ``` or written out with parentheses for clarity: ``` CH3CH(CH3)CH2CH3 ``` --- **Explanation:** - This molecule has the same molecular formula (C₅H₁₂) but a different connectivity than the original. - This is **isopentane (2-methylbutane)**, an isomer of neopentane. --- **Final Answer:** **CH₃CH(CH₃)CH₂CH₃** (2-methylbutane, isopentane)