O.oer these are a bit mean.
I'll go through 4 and see if you can do the rest.
One way to name it is to name is based off the alkene. This is because alcohols have the prefix: hydroxy- whereas alkenes have no prefix.
To get the lowest numbering, you'd want to start at the carbon with the alcohol group.
Therefore this molecule is 1-hydroxy-2-methylpent-2-ene.
But perhaps the more correct way (which you might not know) is:
It's both an alcohol and an alkene, which comes under a new group called
enolsThe reason why this is more correct is that the alcohol functional group (-OH) has a higher
priority than an alkene functional group and so it should be the suffix of the name. So we use both suffixes.
We still start numbering at the carbon with the alcohol group as it takes priority.
To name this molecule would be 2-methyl-2-penten-1-ol
Here's a video if you're unsure:
https://www.youtube.com/watch?v=NrjxBCwxalQ5 is like 4 but you've got a chloro group.
In number 6, the main functional group, if you didn't know, is an aldehyde and it also has a higher priority than the alkene functional group (I don't think it even has a prefix anyway). If alcohol/alkene hybrids are called enols, what could aldehyde/alkene hybrids be called?
Apply similar reasoning to number 7.
If you get it, great! If not don't worry too much.
I hope someone else responds so that I'm not wrong xD