Question

The correct IUPAC name of CH\(_3\) - C(CH\(_3\))\(_{2}\) - O - C\(_2\)H\(_5\) is

• A. Tertiary butoxy ethane
• B. 1, 1-Dimethyl-1-ethoxyethane
• C. 2-ethoxy-2-methyl propane
• D. Ethoxy tertiary butane

Hint:

For IUPAC naming of ethers, remember the rule: (Smaller alkyl group as alkoxy substituent) + (Larger alkyl group as parent alkane). Always find the longest continuous carbon chain for the parent alkane.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
According to IUPAC nomenclature for ethers, the longer carbon chain is treated as the parent alkane, and the shorter alkoxy group is treated as a substituent.
Step 2: Key Formula or Approach:
Apply IUPAC rules: identify the longest continuous parent carbon chain, treat the $-OR$ group as an "alkoxy" substituent, and number the chain to give the substituents the lowest possible locants, arranging them alphabetically.
Step 3: Detailed Explanation:
Structure: $CH_{3} - C(CH_{3})_{2} - O - CH_{2}CH_{3}$
1. Identify the longest chain: The chain bonded to the oxygen on the left side has 3 carbons ($CH_{3}-C-CH_{3}$ with a methyl branch). This is a propane chain.

2. Identify the substituent: The group on the right side of the oxygen is an ethyl group, making the substituent "ethoxy" ($-OCH_{2}CH_{3}$).

3. Numbering: Number the propane chain to give the ethoxy group the lowest possible number. Starting from either end of the horizontal chain, the central carbon is position
2.

4. Substituents at position 2: There is an ethoxy group and a methyl group.

5. Alphabetical order: "e" in ethoxy comes before "m" in methyl.
Result: 2-ethoxy-2-methylpropane.
Step 4: Final Answer:
The correct IUPAC name is 2-ethoxy-2-methyl propane.