Q79 / 240 · KCET 2026 · Chemistry
The correct IUPAC name of 
is
is- ATertiary butoxy ethane
- B1,1-Dimethyl-1-ethoxyethane
- Correct answerC2-ethoxy-2-methyl propane
- DEthoxy tertiary butane
Solution
To find the correct IUPAC name for the given ether, we follow these steps:
1. Identify the longest continuous carbon chain to serve as the parent alkane. The alkyl groups attached to the oxygen atom are an ethyl group ($-C_2H_5$) and a tert-butyl group ($-C(CH_3)_3$).
2. The longest carbon chain in the tert-butyl group has 3 carbon atoms. Therefore, the parent alkane is propane.
3. Number the parent chain to give the substituents the lowest possible locants. Numbering from either end of the 3-carbon chain gives the central carbon the number 2.
4. Identify the substituents attached to the parent chain at carbon-2:
- A methyl group ($-CH_3$)
- An ethoxy group ($-O-C_2H_5$)
5. Arrange the substituents in alphabetical order. 'Ethoxy' comes before 'methyl'.
Combining these parts, the IUPAC name is 2-ethoxy-2-methylpropane.
Answer: 2-ethoxy-2-methyl propane
1. Identify the longest continuous carbon chain to serve as the parent alkane. The alkyl groups attached to the oxygen atom are an ethyl group ($-C_2H_5$) and a tert-butyl group ($-C(CH_3)_3$).
2. The longest carbon chain in the tert-butyl group has 3 carbon atoms. Therefore, the parent alkane is propane.
3. Number the parent chain to give the substituents the lowest possible locants. Numbering from either end of the 3-carbon chain gives the central carbon the number 2.
4. Identify the substituents attached to the parent chain at carbon-2:
- A methyl group ($-CH_3$)
- An ethoxy group ($-O-C_2H_5$)
5. Arrange the substituents in alphabetical order. 'Ethoxy' comes before 'methyl'.
Combining these parts, the IUPAC name is 2-ethoxy-2-methylpropane.
Answer: 2-ethoxy-2-methyl propane
Hence, the correct answer is option: 'C'.