Question 4 of 32intermediate🔧 ApplyShort Answer2 marks

Write structural formulas of the following compounds: (i) 3, 4, 4, 5–Tetramethylheptane (ii) 2,5-Dimethyhexane

(i)
Answer

CH3−CH2−CH(CH3)−C(CH3)2−CH(CH3)−CH2−CH3\text{CH}_3 - \text{CH}_2 - \text{CH}(\text{CH}_3) - \text{C}(\text{CH}_3)_2 - \text{CH}(\text{CH}_3) - \text{CH}_2 - \text{CH}_3

(ii)
Answer

CH3−CH(CH3)−CH2−CH2−CH(CH3)−CH3\text{CH}_3 - \text{CH}(\text{CH}_3) - \text{CH}_2 - \text{CH}_2 - \text{CH}(\text{CH}_3) - \text{CH}_3

Explanation

To write the structure from the given IUPAC name, first write the longest chain of carbon atoms corresponding to the parent alkane. Then, number the chain and attach the substituents to the correct carbon atoms. Finally, satisfy the valence of each carbon atom by putting the requisite number of hydrogen atoms. For (i), the parent chain is heptane (7 carbons) with four methyl groups at carbons 3, 4, 4, and 5. For (ii), the parent chain is hexane (6 carbons) with two methyl groups at carbons 2 and 5.

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