Question

These are related as:

1. Position isomer
2. Chain isomer
3. Functional group isomer
4. Metamer

Answer 1

The answer to this question lies in the fact that the pair of given compounds is named based on the nature of the alkyl group which is attached to the functional group which has a particular name for the pair.

Complete Solution :
We have come across the concepts of organic chemistry in the chapters that deals with the stereochemistry that tells us about the arrangement of atoms in a molecule in space.
Now, let us see the meaning of each term given in the option which will later help us to conclude the right answer.
- Stereochemistry is the part of organic chemistry which deals with the study of how the molecule is affected by the arrangement of their atoms in the space.
- This stereochemistry is also known as three dimensional or 3D chemistry as the word stereo itself means three and this is based upon the imagination of the atoms in the space.
- Chemists use this part to study the relationship between the molecules that are made up of the same atoms.
- In option 1) Position isomer simply means the constitutional isomers that have the same carbon skeleton and also same functional group but differ in the location of the functional group on or in the carbon chain.
- In option 2) Chain isomers are those with the same molecular formula but different arrangement of carbon skeleton.
- In option 3) Functional group isomers are those with the same molecular formula and have different arrangements of functional groups in the chain.
- In option 4) Metamer is the one in which the carbon chain varies but the functional group remains in the same position.
Thus, in the above given compound there is change in the position of the alkyl group attached but the functional group –O- remains the same. Therefore, it is a metamer.
So, the correct answer is “Option 4”.

Note: Note that positional isomers and metamers are different although it sounds same and the difference is that positional isomers is just change in the position of functional group and no change in the carbon chain whereas metamers are those in which functional group is fixed but alkyl group varies.