Question

What is the IUPAC name for?

Answer 1

For the name of the given compound first, count the number of carbon atoms in the chain and as we can see that the functional group in the given compound is a triple bond so in the suffix part, yne will be written.

Complete answer:
The given compound in the question is an organic compound so, to find the IUPAC name first, we have to count the number of carbon atoms in the main chain of the compound. The given compound in the question is:

In this compound, there is only one chain of carbon atoms, so it will be the main chain. There are six carbon atoms in the chain.
For the specific number of carbon number in the chain we use specific terms like for one carbon atom we use meth, for two carbon atoms we use eth, for three carbon atoms we use prop, for four carbon atoms we use but, for five carbon atoms, we use pent, for six carbon atoms we use hex, etc.
Now, we have to check the functional group in the given compound. As we can see that there is a triple bond present in the compound, so it is an alkyne and in the suffix part, yne will be written.
When we start the number in the compound, the lowest number given to the triple bond is 2.

So, the IUPAC name of the compound is Hex-2-yne.

Note:
If you do the number from the wrong side then you will get the name as:

Hex-4-yne
But this is wrong because the functional group should always get the lowest number.