CHEMISTRY : Organic Chemistry

[00:00:00]Problems with organic chemistry. Let me start from here. We have got compounds A and C. And we are taught to identify the compounds. How do we identify these compounds? Come closer. When you see a double bond, you see what? A double bond. It's an alkane.

[00:00:18]Alkane. E N E. Okay?

[00:00:23]Are we there?

[00:00:24]When you see two carbon atoms, there are how many carbon atoms? Two. So, two carbon atoms, okay?

[00:00:32]Okay? Atoms.

[00:00:34]Just know that that compound, okay, starts with eth.

[00:00:41]Are we there?

[00:00:43]Ends with For a double bond, it ends with E N E.

[00:00:49]Two carbon atoms, it is starts with this. Think about it.

[00:00:53]Two carbon starts with this.

[00:00:56]It's a double bond, ends with this. So, let's add the end and the beginning together.

[00:01:03]Together, ethene.

[00:01:06]That's what you you were supposed to be taught from the beginning.

[00:01:11]Come here.

[00:01:12]This is um an isomer. Do you know what an isomer is? An isomer is a compound with the same uh molecular formula, but a different display formula. You can say the display formula is different, but the molecular formula will be the same. All right?

[00:01:28]So, consider the longest chain. The longest chain is this. Because there are three carbon atoms.

[00:01:35]So, three carbon atoms starts with I'm saying it starts with prop.

[00:01:43]Three carbon atoms starts with what?

[00:01:45]Prop. Can you see any double bond here?

[00:01:48]No.

[00:01:49]You can only see single bonds, right?

[00:01:51]Uh-huh. So, single bonds okay, indicates an alkane.

[00:02:00]It ends with a n e. So, we know that the longest chain start with prop and end with the a n e. Are we there? So, we know that it is a prop then add a n e, we have this.

[00:02:14]But, there's something else again.

[00:02:17]Check. If this is your carbon number one, this is your carbon number two.

[00:02:21]There is something on carbon number two.

[00:02:23]Check on carbon number two. There is a carbon.

[00:02:27]Okay.

[00:02:28]There's a carbon and three hydrogen atoms surrounding that carbon.

[00:02:33]It has branched from there.

[00:02:35]This is what we call the side chain. And a side chain with one carbon atom, one carbon atom start with the meth.

[00:02:47]It's a methyl.

[00:02:49]A side chain with one carbon atom is a methyl. A side chain with two carbon atoms, it's what?

[00:02:57]Ethyl. With three carbon atoms, propyl and so on.

[00:03:03]So, this side chain, methyl, is in is on carbon number what? Number two. So, you you are going to write it two methyl.

[00:03:16]So, methyl is on carbon number two.

[00:03:18]That's what the two is in front is doing. So, this is a two methyl propane.

[00:03:24]That's all.

[00:03:27]My number is there. Let us learn together. Revise together.