Don"t apologize! This was the perfect example to look at for a tricky homework question!

@howiecraig3034

8 жыл бұрын

+Kyle mann That's exactly what I thought! In the last video I was like "Hey, something is very wrong about this structure" but that example really tells someone if they understand the naming convention or not. :)

I learn best through mistakes so thank you for showing this!

you helped me get my math level up from 2 grade. to 4 from Kahn academy . now I'm learning this. And if it wasn't for these videos I wouldn't feel confident in perusing my G.E.D or now know as. H.E.S. thank you man with photo shop. your helping me change my life. And I couldn't be more grate full. thank you very much.

"This is going to be…4…4 methyl…. 4 methyl… this is our methyl group right here… 4 methyl….4 methylnonane!" :-D

@aaronhe6877

4 жыл бұрын

Correct!

@thatsgrim4309

4 жыл бұрын

this comment was written 6 years ago but it's still funny

@manjuldevsharma7166

3 жыл бұрын

Why you bully him ;(

Awww you're so cute

I love Khan Academy. Quality education ❤

im just thankful that you are sharing your knowledge! And its awesome of you to correct it and give credit to the person who pointed out the problem. Thank you.

Thank you for sharing your gift.

Thanks for helping me through me A-levels. These videos have been very valuable, and I've just started my course.

just found you on Reddit. thanks very much Khan, will watch many more of your videos. you're a benefit to those with thirsty minds, thanks for the fountain of knowledge, sir.

this dudes legit, styling on all my chemistry lecturers all day everyday. Reps

I'm sending my gratitude from the UK, your videos are so helpful :D

Just enrolled in khan academy...and its really awesome here...Thank you so muchhhhhhh

Woah, mind blown!!!! Thanks for the correction.

That definitely helped cement the concept.

At least this proves he is human.

yes! I just know to keep a heads up with stuff like that I guess. I'm glad someone else noticed it because I was like huh...?

THANKYOUUUUUUUUU!

Nice reference.

Thanx! 😊

Thank you

@ newman589 sal is correct. The branch is named by how many carbons it has. The backbone (ane) is also named by the number of carbons. I had to look again to see.

Take a shot every time he says “4-methyl”

I was actually wondering about this for a long te after watching the previous video ,darn😂

Well a "2 propylheptane" would simply be five carbon atoms in the main chain, then three carbon atoms attached to the second carbon atom in the main chain. Right?

Ty.. great Job. anyways..

OMG I also realized that in the previous video but I actually thought I was wrong

so good

what does the yellow line represent in the 2-propylheptane molecule? I thought it would be 8 instead of 9

@mahmoudal-maghraby3036

2 жыл бұрын

Ur actually correct, it just slipped from him.

Finally you're doing Ochem, Sal, you have no idea how many lives you will save with your ochem videos lol

The mistake and subsequent correction was good, as it lead to a better understanding for the viewer.

now, this is mainly because of the rules, but ...from a purely scientific point of view, the 2-propyl heptane ...does exist, it's just that we preffer to call it 4-methyl nonane because we have these fancy rules ^__^

@Ntwadumela266

9 жыл бұрын

you're correct, its just the IUPAC way dictates how we should name it i think

Broke: 2-propylheptane Woke: 4-methylnonane 🅱️espoke: 2-pentylpentane

yes for the first answer and no for the second. the rules of naming start to change as you bring in more substituents because the priority changes with each substituent.

YOU'RE AWESOME

I LOVE YOU!

Looks like if the added chain is bigger than the prefix number than you go with the added chain. Ex. 2, propyl? Propyl is 3 and 2 is (usually) 2, so (3 being bigger than 2) you go with 3. Not bad. Live and learn.

U r great

... at least I didn't notice where the mistake had made... Oh I see... I will be careful next time...

I thought so too, but it actually wasn't a mistake. Take a look at how a methyl or ethyl are attached, and you'll see how the one line is supposed to be included. If it is not, then the attached carbon chain will always be short one carbon.

Isn't it supposed to be 4-propyl nonane. I don't understand why it's methyl.

@KaushikMishrakk

9 жыл бұрын

No because in the 4th place of the longest carbon chain, a branched off substituent is found (the pink color bond) so there only one C atom is present so prefix cant be prop .. see the figure clearly !

3-methyl nonane

wait then is there even something called 2-Propylheptane ?? If there is then how to draw ?

@lakshmananvaidhyaraman852

8 жыл бұрын

thnx understood ...

#4

I WANT TO HUG THIS GUY!

Bro made another mistake. take a look at 1:01 the propyl group and the heptane group are "attached" with a yellow line that isn't part of the molecule. at 1:30 that yellow line was mistaken for a part of the carbon chain and was colored in. as a result we ended up with a 4-methylnonane, while the correct correction would be 3-methyloctane.

Yo I knew I wasn't trippin

sry to interrupt you but you made a mistake at 1:35 because as you correctly maintaned you added a propyl chain which has 3 carbons but when you counted the longest chain you also counted your green-yellow connection line to the whole chain. so in the end you get an nonane which should just be an OCTANE....

@heathernoriega1412

3 жыл бұрын

Going off this, wouldn't it be 3-methyl octane? Right?

chill dude... my chem teacher make mistake all the time, but he did as least come back and fix it

Olha o telefone!

Can this molecule also be named as 6-methyl nonane if you start counting from the right side?

@kaufmanat1

2 жыл бұрын

You always count from the shorter side... He responded a year after the question was asked.

Be my teacher

but propyl means 3, and you drew 4 carbons connected to the chain? do you not count the carbon connected to the chain?

@Faa334

6 жыл бұрын

he did not drew 4 carbons he did drew three then he connect the carbons together just drew the lewis structure and you will know what I am talking about

@trey2325

6 жыл бұрын

Nope

@RaghaviSRaj

6 жыл бұрын

Faris502 but then why did he count it to be nonane it should have been octane if it was 3 carbon

@lyzh4288

6 жыл бұрын

No, it's nonane. You might've forgot to count a carbon on the one of the ends

@rotopope

5 жыл бұрын

4 is where the methyl side chain is. There are three more carbons preceding that (3,2,1) so if that were a side chain it’d be a propyl.

Octane*

Come to England and teach your asian kids please

who is this? now it's all green???? corrected?

Big Oopsie

Sal makes mistakes???!

@RevanthBoomBoom

9 жыл бұрын

correcting them is more important i think.

all video of khan chemistry has no level......it is only for bord not for compitatiton

omg. I HATED teachers in India. Not only their way of teaching but also how arrogant they are!

Please don't bother teaching if you don't even know the basics.