Identification of Primary, Secondary and Tertiary Alcohols

By Brian Lemay 10 comments


As we know that alcohols are the hydroxyl derivative of alkanes So, here you can see that one hydrogen atom get replaced with this OH group Therefore this compound is known as the alcohol Here you can see that this carbon is sp3 hybridised carbon atom When the OH group is attached to sp3 hybridised carbon atom Then we can classify this alcohol into three different classes The first one is primary second is secondary and third one is tertiary alcohol In primary alcohol you can see that when one hydrogen atom get replaced with any alky group such as R1 then such type of compound is know as primary alcohol here we have to remember that if all these three hydrogen atoms remain as it is Then also this compound is primary alcohol In secondary alcohol two hydeogen atoms get replaced with two alkyl groups such as R1 and R2 These R1 and R2 may be same or different such type of compounds are know as secondary alcohols Now here you can see that all these three hydrogen atoms get replaced with the alkyl groups like R1, R2 and R3 Here these all alkyl groups may be same or differnet such type of compounds are know as tertiary alcohols Now Let’s take some example to identify weather these compounds are primary, secondary or tertiary alcohols Now you can look toward the example number one here the first example is methanol all these hydrogen atoms are present as it is on this sp3 hybridised carbon atom and therefore this alcohol is primary alcohol Now Let’s look toward the example second here we have to focused on the carbon where OH group is present here three hydrogen atoms get replaced with the similar type of alkyl group like methyl group it means that when three hydrogen atoms get replaced then such type of compound is known as tertiary alcohol In case of third example now if you see this carbon i.e. sp3 hybridised carbon where OH group is attached At that time you will notice that one hydrogen atom get replaced with this ethyl group Now don’t confuse with the example number one and three here you will see that all three hydrogen atom are present and this is known as primary alcohol Similarly, when one hydrogen atom get replaced with one alkyl group then this is also known as primary alcohol Now, Let’s take little bit complicated example so we have structure oven here In example fourth now we have to focused on carbon on which OH group is present now here all these three hydrogen atoms get replaced with these groups so this is methyl group this is also the methyl group this is little bit the bigger group get replaced with the third hydrogen atom so, automatically this compound will be tertiary alcohol We have to not bother about the which alkyl group is present but we have to just bother about how may hydrogen atom get replaced with any alkyl group Now let’s concentrate on last example Here we have this carbon where OH group is present so you can see that we have replacement of one hydrogen by this group and the other hydrogen atom get replaced with this group it means that two hydrogen atom get replaced by two different alkyl groups and therefore this compound is secondary type of alcohol.

10 Comments

Dr. Anil Palve Academy

Jun 6, 2014, 7:56 am Reply

Now you can watch video with captions……Enjoy an unconventional free education for everyone……….

Andile Mathebula

Nov 11, 2015, 9:43 pm Reply

Wish I could hear you speak

Andile Mathebula

Nov 11, 2015, 9:43 pm Reply

Wish I could hear you speak

dharmender kumar

Sep 9, 2016, 6:32 pm Reply

excellent^_^

Anmol Maddheshiya

Feb 2, 2018, 1:56 pm Reply

In 4th quest confusion

RANU SAROJ

Oct 10, 2018, 3:18 am Reply

Very nice video sir and thanks a lot

gshakidh gshkzuch

Mar 3, 2019, 2:57 am Reply

Sir first wala primary nhi h .
1 alkyl grp is needed for 1 degree

Albert Kujur

May 5, 2019, 4:53 pm Reply

Thanks a lot.

Alien Ware

Jul 7, 2019, 1:23 am Reply

Clear Cut Thank you I can get atleast 1 mark for these indentifications!

Prakash V

Sep 9, 2019, 3:49 pm Reply

It's nice explanation

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