IUPAC Nomenclature of Haloalkanes and Alcohols

[@ProfessorDaveExplains]

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[@TroyW13]

Great videos Dave, as always. Love the IUPAC concept when all the professional heads got together and essentially said: "We'll name everything with a distinct order and use the alphabet to our advantage for simplicity, except when it doesn't suit us, in which case we'll just do this with iso."

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[@memoonamazhar2980]

why am I finding out about you right now? I wish I had found you before my midterms... well I guess better late than never... Hopefully I can still bring up my grades, I was having the hardest time naming the compounds, thanks for clearing that up! you are amazing!!!

[@ProfessorDaveExplains]

make up for it with a killer final exam!

[@muhammadaftabalam7412]

amazing, how it becomes possible for you to recite such intricate concepts so clearly.it seems that you are reciting a poem and not chemistry.

[@helmetongrass1893]

5:40 wait, so n and neo are not supposed to be considered for alphabeticity either? just iso?

[@srijaneedhar5522]

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[@adhiyanthaprabhujeyashanka2091]

Do we list halogen groups firstly in the name ? Because in the last nomenclature example professor dave just mentioned 6-iodo first despite the fact that hydroxyl group appears first alphabetically

[@gimme_a_good_name_bruh]

The hydroxyl group must be the most important ie the functional group. The halogens are substituents

[@hebashahid8952]

it's because of the suffix OL Alphabetically OL would come afterwards

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[@trizsaballon6198]

Hi. In the last example, why was iodine named first instead of the hydroxyl group? Sorry little confused with the alphabeticity

[@ProfessorDaveExplains]

so a hydroxyl modifies the suffix of the molecule, "ane" becomes "ol", so we name it at the end. things like alkyl and halogen come first but more significant functional groups are part of the parent name

[@trizsaballon6198]

@@ProfessorDaveExplains thank u so much!!

[@emem2162]

Thank you, Prof Dave! Your explanation is easy to grasp. You saved me!

[@gabrielmensah6113]

At 4:28 is it 7-iodo-2-heptanol or 6 iodo 2 hexanol. I see 7 carbons instead of 6

[@ProfessorDaveExplains]

6 carbons. iodine is not carbon

[@srinivasareddypetluru8227]

sorry sir i write spaling Mistakely type sir now i correct alcohols thank you Sir

[@amudhadeepa6164]

Can you please explain the nomenclature of 1-bromobut-2-ene and why it is not called 4-bromobut-3-ene? Thanks

[@ProfessorDaveExplains]

we number so as to give the double bond occurring sooner

[@CaptainFlashStriker]

Why you wrote 6-iodo first, when alcohol has more priority than iodine 4:00

[@ProfessorDaveExplains]

hydroxyl goes in the suffix, substituents come first

[@sheymaravilla4518]

Student here! From Philippines hihi

[@curtpiazza1688]

Excellent clear presentation!

[@anilkumartambe9949]

2:50 to 2:54

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I whish I could explain things as clear and thoroughly!

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[@emiliaw6395]

You are so helpful! Thank you for explaining things so clearly. You're so good at teaching so much in only a few minutes!

[@saurabhsibal00]

Hi, when naming Haloalkanes, I have heard of conflicting rules in terms of which element gets the lower number (if the numbers end up being same from left to right or right to left). In the video, it is mentioned that the “one occurring sooner alphabetically” gets the lower number. But, other places I have heard say that the most electronegative will be assigned to be the lower number. Which way is correct according to IUPAC (alphabetical or electronegativity)?

[@ProfessorDaveExplains]

interesting! i had always heard alphabetical, but it is a situation that comes up so rarely that i never even really checked. i would be curious to read something that mentions electronegativity. it seems unlikely, because then the person may have to look up an electronegativity table, whereas alphabeticity is obvious, and the rules are arbitrary after all.

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Very good explanation

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[@ashishkumarsharma1323]

Hi Prof Dave! I wanna ask if propan-2-ol and 2-propanol are same? Or they differ? Thank you. You're the best. :)

[@ProfessorDaveExplains]

totally synonymous!

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[@alexiamiladinov8393]

Hi Dave, I am wondering if there is a specific language alphabet that you use when naming the molecules. For example if we have the 1,3-dibromo-2-chloro-4-ethylpropane molecule and if I'm supposed to write it in swedish instead chloro would be kloro and then I'd have to write 1,3-dibromo-4-etyl-2-kloropropan, would this be correct or do I have to think of the alphabetic order of a specific language, for instancde English?

[@ProfessorDaveExplains]

oh interesting! well i think IUPAC set all the rules for the english language only, so i don't really know how it would work in other languages. i would just learn everything in english though, that's the official language of chemistry!

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[@itzzmrhk]

Prof. If one or more than fuctional group attach with chain i e COOH , and CHO what we prefer for numbering please Help?

[@saracululejevic7950]

So Dave do all halogens in a compound naming come before alkane side groups or is it just alphabetical? In the first example u had methyl last just because its alphabeticly last or not? Also in case the methyl was the nearest to the first carbon in the chain would the numerical order go after the methyl group? Thank you!

[@ProfessorDaveExplains]

alkyl and halogen have equal priority, so all of them will just be placed in alphabetical order!

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I reckon he makes some decent psychedelics in his spare time, Why else learn organic chemistry.

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Helpful video and thank you sir ....

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This really helped! Thank you!

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best professor

[@gliese832c]

What about tennessoalkanes...

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THANK YOU

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Thank You for the class Chemistry Jesus

[@gugulethumoyo67]

thank you dave

[@R.Bharathkumar2003]

I know that In numbering a given compound the numbering is in the order functional group > double bond> triple bond > substituents am I correct bro

[@rayanfarid7639]

I think triple bond should be numbered sooner than the double bond but other than that it is correct

[@sternits]

I thought it would be pentan-2-ol or do both names follow IUPAC rules?

[@ProfessorDaveExplains]

yep identical

[@ranjeetsohanpal752]

I have a problem naming the ether compounds.How can we name this compound CH3-O-CH3? And others like these?

[@ProfessorDaveExplains]

just name the alkyl groups! that would be dimethyl ether.

[@ranjeetsohanpal752]

@@ProfessorDaveExplains Thank you very much sir,but what is the name if the chain is unsaturated like CH2=CH-O-CH3?

[@Mschick3n]

1,6-Dibromo-6-methyloctane is incorrect what is the correct name for this? Should I count first to nearest carbon that has many substituent? Help pls

[@ProfessorDaveExplains]

it sounds right to me

[@Mschick3n]

That's what I thought too. I've been watching a tutorial, and i still don't see what's wrong in the given name

[@loysaaa2185]

How about sec butyl in alkyl halides?

[@vindyakelum90]

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[@prashantabhattacharjee8971]

why the hydroxyl group is prior to halogen group?

[@ProfessorDaveExplains]

That's just what the IUPAC decided.

[@nileshchaudhari3295]

you are awesome sir.

[@EpicSelenium34]

What is your favorite halogen?

[@ProfessorDaveExplains]

haha i dunno... bromine.

[@majidalyafai6664]

what is the major difference between alcohol and aldehyde?functionally ?

[@ProfessorDaveExplains]

+wmajed joo totally different. a hydroxyl group can act as a nucleophile, a hydroxyl is about six orders of magnitude more acidic than an aldehyde, an aldehyde is electrophilic at the carbonyl carbon, the list goes on!

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Prof Dave 😢

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[@OforiVera-pl9th]

How to name amines and isomer

[@Ava-fx4ip]

Is 2-pentanol and pent-2-ol the same sir?

[@ProfessorDaveExplains]

it would have to be pentan-2-ol, then yes that would be the same as 2-pentanol

[@rubaabdo9579]

great man!

[@banuganesan4104]

Can we also write pentan-2-ol?

[@ProfessorDaveExplains]

yep!

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Thank you!!!

[@zhimeiyuan9388]

For heloalkane, which one has higher priority?

[@ProfessorDaveExplains]

halogen and alkyl have equal priority

[@zhimeiyuan9388]

If we have bromo, chloro and methy on the cyclohexane, which one we usually count first for naming? I know the name will go like bromo- chloro-methycyclohexane. But i dont know. Where i should start

[@ProfessorDaveExplains]

check out my tutorial on naming cyclic compounds

[@danieldeepak474]

Dear sir I'm very bad at chemistry as I do not know the basics will I be able to learn all of the basics as I'm in the 11th grade already

[@ProfessorDaveExplains]

if you're in high school, you don't need any of this organic chemistry stuff! my general chemistry series should be more than enough. but of course if you are really interested in it, it never hurts to get a head start so that you have an easier time with it in college.

[@elyaaa8460]

Actually, I am in Canada and here in the Ontario region if you are studying chemistry in grade 12 this is a unit in the curriculum.

[@namenlos3574]

In German you have no o at the end and alkane is without the e

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Good

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I feel bad for those who do line structures, the other, more drawn out way makes much more sense.

[@ProfessorDaveExplains]

line notation is the only legitimate way to depict organic reactions

[@viiperbiite]

@@ProfessorDaveExplains That's all very fine and I don't disagree with you. However, it's not that useful to me because my country's high school exams use what I guess would be called 'fully displayed formulae.' And I suck at chemistry so I'm surprised I've come as far as I have in it at my school.

[@folklore132]

4:30

[@leowo9]

In the last example, wouldn't iodo come after hexanol as 'h' is sooner alphabetically than 'i'?? So the final name would read this way: 2-hexanol-6-iodo...?

[@ProfessorDaveExplains]

Vasu Singh the parent name of the molecule is hexanol, so that will go last, after we list all the substituents.

[@leowo9]

Professor Dave Explains Ohhh... Yeah. xP Thanks a ton for the fast response! :D

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