I love how you change the colour all the time. Now when I think about it, I don't even bother reading whenever the text is in the same colour. It becomes so messy.

At 0:35, it says they are all double bonds, but it should say they are all single bonds, hence it being an alkane (a completely saturated hydrocarbon).

@roysroysroy

8 жыл бұрын

+PsychoAnalyticalDan just a mistake...

I think you meant to say all single bonds on the first one but u said all double bonds by mistake

Thank you for these videos! Going back to advance degree and finding myself in Organic chemistry again after 23 years!!! What a help!

just just WOW. u r one of THE BEST teachers, online or otherwise. Thanks so much Sal hope my thanks find u.

wahhh.. you are so gonna save my grade for my preliminary exams now.. i love you so much !!

@0:32 Didn't you mean 'single bonds' there?

@daserstereichen

7 жыл бұрын

had to hear 3 times to confirm, he said double

@mihirdeshpande4345

7 жыл бұрын

Bernharde it is single bonds

@ravitaarya

5 жыл бұрын

Yeah, I also confirmed by watching that again, he said wrong

How can someone DISLIKE this video? Good job, Best teacher EVER! :)

So helpful! Thank you so much.

thanks for making me not failing anymore on chemistry!

Thank you, much better than regular teaching :D

Thanks Khan, great organic chemistry video.

Loving the 4,5-bid(methylethly) :D tongue twister!

In the previous video you said you don't look at the "iso" part of isopropyl when naming the entire molecule using the alphabetical rule. But in the third example you only disregarded one of the prefixes, "di". Can you elaborate on the alphabetical rule? Do you only disregard the first prefix? Or do you only consider the "methyl" and "propyl" parts?

@hoppingwiththehares2574

5 жыл бұрын

in case your glued to your chair still waiting on the response, yes you should write it 2,2-dimethyl-4,5-diisopropyloctane

@hoppingwiththehares2574

5 жыл бұрын

oops, 2-dimethyl-4,5-diisopropyloctane

@juabz7697

5 жыл бұрын

@@hoppingwiththehares2574 not at all. The iso part take part in the procedure.

The common name for the third molecule should be 4,5-disecpropyl-2,2 dimethyloctane. the propyl groups on 4 and 5 are in the classic sec-formation (2 carbons attached to the first carbon joining the backbone). An iso would be if only one carbon is joined to the first.

Great! Learnin a lot! 😊😊

thank god for this guy

Good job on your video I liked it very much!

Thanks to you even a 6th grader could learn this if they are dedicated enough or at least try to.

Helpful video.

@iwlmlfj the methyl is attached to the first carbon (1) (counting from the backbone) of the ethyl group. Hence 1 methylethyl.

you teach better than my teacher :)

thanks

Great video!

good catch!

Since when does brian from family guy teach chemistry ? Hes good

thank you sal for poiting that methyl group out, I thought it a ethyl group ,

I love this video, I just add that the last example the name is 4,5-diisopropyl-2,2-dimethyloctane

extraordinary

At 8:38, you said that you were gonna use systematic naming and you used the prefix "di" and some minutes before you said that "di" is not used for systematic naming, or there are exceptions?

Love ya! I keep writing on all of your videos that I am applying for a job teaching Organic. One day I am gonna post that I AM teaching it. One day. I am trying so hard with everything I have. Anyway, sorry for the ramble. You are excellent teacher yourself.

@princessbloomofdomino950

7 жыл бұрын

Awhhhhh you'll get there!

@danamclemore3805

7 жыл бұрын

Princess Bloom of Domino I appreciate that comment.. Thanks!

@princessbloomofdomino950

7 жыл бұрын

Ms Philomath No problem. I want to get better at chemistry myself, it's just so difficult. What makes you want to teach chemistry, instead of becoming a surgeon or doctor?

@danamclemore3805

7 жыл бұрын

I have 2 polar opposite degrees: English and Marine Biology. Havoen't been the most "Stable" person though and have ruined a lo of Princess Bloom of Domino opportunites. I just LOVE Organic and LOVE helping students. I am good at it despite my ....issues!!! You know?

@azyle2104

2 жыл бұрын

@@danamclemore3805 hey hey how's it going ?

cyclohexane serves as the parent chain whereas cyclopentyl acts as the substituent simply because it has a lower carbon chain.. so it should always be cyclopentyl cyclohexane (the parent chain should be the last part of the name)

I think its because it attaches to cyclo hexane thus making it cyclo pentyl instead of cyclo pentane. Think of it as an attachment like the other ones you normally see.

I was wondering and worrying if I was wrong because you were putting dashes instead of commas (third example), but it turned out you corrected the dashes... hahahah thank you for this video! It really helped a lot.

A few people have asked the difference between naming with bis and di, but nobody has adequately answered. Somebody said bis is systematic but di is used in systematic too. What is the rule here?

Around 8:00 you used the 'bis' to indicate that there are 2 (1-methethyl) in the carbon chain. What are the precise criteria to use this 'bis' and is there a list of different amounts should learn to use it on other alkanes? Thank anyone very much if they take the time to answer this question.

@jvcrules yeah its a single bong because its an alkane

@jvcrules yeah its a single bond* because its an alkane

@bradleyhb No it's 1 carbon expressed a meth, I dont see convolution it appears to be expressed as simply as posible. 2, 2 di meth each expresses something else, nothing is repeated.

since two methyl groups are attached to the same carbon, its di-methyl.. and two (1-methyl ethyl) are attached to different carbons, its bis-

@jvcrules correct, they are all single bonds = ANE.

Thanks to all staff of Khan academy, excellent jobs. Bringing education closer to all. But I will like to comments on the organic naming, The letter used to do the explanation is too small. let's make it more bogus. Thank you.

When is bis used? When dealing when bracketed complex groups?

You don need the 1 in front of (methylethyl) because if it was on the second carbon it would just be a propyl chain

"sec-" should not be used before propyl group. "sec-” should only be used when it is a 4-carbon group branches out in to two dirctions and connect to main part in the middle. Any thing made up by less than four carbon or more than four carbon should avoid using "sec-"

@user-xw2im7ke4l

7 жыл бұрын

www.chem.ucla.edu/~harding/IGOC/C/common_name.html (reference)

@computerlover9290

2 жыл бұрын

Where do you know this from?from which book? I really want to learn these perfectly and I always thought khan academy is the best place but I think I'm seeing discrepancies between the videos on this series and I think I should look at another resources but I don't know where to look at.

at 4:42 are you sure that you have to use "2-2-" instead of just one single "2"? Wouldnt that be sufficient in describing where the two methyl groups attach? So 2-dimethyl instead of 2-2-dimethyl?

Why 2,2-dimethyl-4,5-bis(1-methylethyl octane) and not 2,2-bismethyl-4,5-bis(1-methylethyl octane). Please anyone answer.

@dennisdong9097

4 жыл бұрын

Zaki Ur Rahman nice Question. Got me Wondering Too Bro

@dhruvpawar3733

4 жыл бұрын

cause bis is used for systematic naming of chains where there is multiple possibility

@togbot3984

4 жыл бұрын

when there is a complex substituent which in "( )" you write bis otherwise di for 2, tris otherwise tri for 3 you get the idea

I have a question, couldn't the "bis" prefix be used in the systematic name of 2,2-dimethyl? I mean instead of "di" - 2,2-bismethyl? Google did not reveal the answer unfortunately...

this is why comments on vids rock

crazy structures of alkanes...

Thanks a lot, you are perfect teacher

I don't see Bis- anywhere in my book. Would I be right with 4,5 (1-dimethylethyl) ? 8:18

Sir at 10:00....why 2,2-dimethyl come first than 1-methyethyl ?

this vid is good. but, which software do u guys use to write on?

whoops! sorry got ahead of myself as always haha! thanksSal! :)

On the last example you used di then bis, why not di for both or bis for both?

for the 3rd example wouldnt it be a s-propyl instead of an isopropyl, cuz it branches off at the first carbon into two more carbons making it s?

is 1,3 cyclobutyl hexodecane a thing?

you used a dash for a comma on the 2, 2- dimethyl group

is it also correct to mention that the 4,5-diisopropyl to be 4,5-dimethylethyl?

tert-, sec- propyl ,, expamples others

@jvcrules I think what he wanted to say was NO double bonds.

is it okay to call the last one: 1-t-buthyl-2,3 di-isopropylhexane ? or is that completely incorrect or unpractical?

Sir, can you please suggest me a good Book for Regent Guide in organic chemistry ?????

what about prop - 2 - yl

in the last example's systematic naming, how did he arrange it based on the alphabetical order? can somebody please clear it up for me?

Why does the methyl group come before the methylethyl group?

Would it be incorrect to say cyclohexylcyclopentane? for the second molecule

is it necessary to include the '1' in '1-methylethyl'? because it the methyl part wasn't on one it would just be propyl?

No, because it violates the longest branch. Within an isopropyl, there must be a longer branch as an ethyl, with a methyl attached. Furthermore, there's another carbon in that description: "dimethylethyl" is an isobutane!

I don't think so because the cyclohexane has a bigger chain of carbons, so it would serve as the "backbone."

No, he meant to say "all single bonds". Benzene has delocalized double bonds, cyclohexane has all single bonds.

Would have 'di' instead of 'bis' been wrong?

The shorter one goes first, just like how in a dictionary super comes before superficial.

In your last example of naming the last octane, wouldn't methylethyl be written before dimethyl? Ignoring the di, of dimethyl the letter "e" comes before "m" in the dictionary. Right? So if I'm correct, the naming of the octane would be 4,5 -bis (1-methylethyl) -2, 2 dimethyl octane.

@Nobody-zq8bl

6 жыл бұрын

Di is ignored, nothing starts with e, both start with M. Methyl comes before methylethyl because the end of a word comes alphabetically before additional letters.

Why methylethyl comes after methyl in 8:30?

@hotchman99 Cctually I just mentioned it because I thought it might confuse someone, it sure confused me for a second. But think whatever makes you happy...

At 0:35 he says "all double bonds", he means/should have said "all single bonds". Single bonds are -ane, double are -ene and triple are -yne.

wouldn't the 3rd one be 4,5 instead of 4-5

#7

Why is it 1-methylethyl? Where is the numbering 1coming from? It says first carbon in the video but hows that first carbon? Im confused only on that part. Help me please

great vid, but now i need a nap!

i call the frament groups substituients

I don't believe you need the "1-methylethyl" to be numbered on the third example, the methyl branch can only have one position on the ethyl chain/branch, therefore it should be named simply "methylethyl".

IUPAC naming seems more simple

he does

iso is included in alphabetizing..while sec and tert are not.

Organic Chemistry Naming Examples 1 you toke the p for propyl and not from the i in the iso propyl

@computerlover9290

2 жыл бұрын

Yes there are discrepancies...

Shouldn't it be cyclohexylcyclopentane due to alphabetical order? H comes before P.

why is it number "1"-methylethyl ...meaning when you have a side chain your numbering effectively starts over again but not really because you still use the main position number in the name...how convoluted.

Does anyone know when it appropriate to use "di" as opposed to "bis"? I don't understand the difference

@reatleatmcpagani4997

4 жыл бұрын

di in common naming, bis in systematic :)

Can we call cyclopentane cyclohexane an undecane? I realise we cant call it cycloundecane because it doesnt create a ring but we could still theoretically call an undecane since you have 11 carbons in it, right?

@jacobdalby1105

8 жыл бұрын

+airking26 i was thinking the same thing.

@nadinethomas9387

8 жыл бұрын

+airking26 there is a line between the cyclohexane and cyclopentane, they not fused together thats why you dont add them up

What if the two rings were joined by the same carbon? Would that even be possible?

@reatleatmcpagani4997

4 жыл бұрын

yeah its the 2nd example he provided

@ArcticGooner Alas, if only chemistry had more bongs

Why is the cyclopentyl group connected to the cyclopentane group, and not the other way around? Could you call it cyclohexyl cyclopentane?

@Group539935

9 жыл бұрын

i think probably because the cyclohexyl group is larger so it follows the same rule as carbon chains, find the longest one and work from that.

why does 'methylethyl' comes after 'methyl' alphabetically? dont they both start with 'm'?

why is it cyclo pentyl and not cyclo pentane?

@marind10

5 жыл бұрын

because your naming a substituent, not the whole alkane. ane is the suffix for alkanes. uyl is the suffix for substituents

Why 'iso' propyl @5:56

@remavas5470

8 жыл бұрын

because it branched and has 3 carbons, 3 carbons mean propyl just add iso- bacause its branching at some point :D

@warchild2726

6 жыл бұрын

I just did it with system name and got: 4,5-dimetyletyl... is it wrong? :/ because in last video where we got something like that "Y" we called it like that

**all single bonds -ane

I just want to let people know that Bis is used by inorganic chemists. It's okay if you are being taught organic chemistry by an inorganic chemist, but Di( 1-methylethyl) is preferred by organic chemists.