00:03
Hi there.
00:03
In this question, we are asked to identify the molecules that are structural isomers.
00:14
Well, structural isomers refer to two or more substances that have the same chemical formula, but a different structure.
00:55
So let's start looking at these.
00:57
Number one has four carbons and the remainder are hydrogen, so it has 10 hydrogens.
01:03
So number one is c4h10.
01:08
Number two, as we look at its formula, it is c5.
01:13
It has five carbons and 12 hydrogens.
01:19
So those two are not structural isomers.
01:22
Let's see what's up with number three.
01:25
Number three is c4h10.
01:30
But as we look at number three, it has the same structural formula as number one.
01:36
They both have a carbon chain, a continuous carbon chain of four carbons, with the remainder of course being hydrogens.
01:50
So when we're looking at a carbon chain, we are looking for the longest continuous chain...