Question

The IUPAC name of is

• A. 1,3-isopropyl-3-methyl propane
• B. 2,3,6-trimethyl heptane
• C. 2,5,6-trimethyl heptane
• D. 2,6,3-trimethyl heptane

Answer 1

The Correct Option is B

The question asks for the IUPAC name of a given compound. To determine the correct IUPAC name, we follow these steps:

1. Identify the longest carbon chain in the molecule. This chain gives the base name of the compound.
2. Identify the substituents attached to the main carbon chain. These are usually alkyl groups like methyl, ethyl, etc.
3. Number the carbon atoms in the main chain starting from the end nearest to a substituent. If there are multiple substituents, number the chain such that the substituents receive the lowest possible numbers.
4. Write the IUPAC name by listing the substituents in alphabetical order followed by the name of the longest carbon chain.

Let's apply these rules to analyze the given options and find the correct IUPAC name: 

1. In the compound named 2,3,6-trimethyl heptane, the longest carbon chain contains seven carbon atoms, which gives us the base name heptane.
2. There are three methyl groups attached at the positions 2, 3, and 6 of the carbon chain.
3. The numbering of the chain is such that the substituents get the lowest possible numbers:

Position	Substituent
2	Methyl
3	Methyl
6	Methyl

The correct name, according to IUPAC rules, is indeed 2,3,6-trimethyl heptane. The other options:

• 1,3-isopropyl-3-methyl propane is incorrect as there is no isopropyl group with the given numbering in the original compound.
• 2,5,6-trimethyl heptane and 2,6,3-trimethyl heptane are incorrect since they don't match the correct position numbers for the methyl groups observed in the compound.

Thus, the correct IUPAC name for the given compound is 2,3,6-trimethyl heptane.