Cannizzaro Reaction | Everything You Need to Know | Jee Adavnced | NEET | AIIMS | Mains
ฝัง
- เผยแพร่เมื่อ 23 ก.ย. 2024
- Hello, Guys. In this Lecture we are going to explain all the important points about Cannizzaro reaction . As You all know that Cannizzaro reaction
is one of the very important topic for Jee Mains/Advance/NEET and AIIMS examination. Here, We will discuss this topic from very basic level to Jee Advanced level.
The disproportionation reaction of aldehydes without α-hydrogens in presence of a strong base to furnish an alcohol and a carboxylic acid is called Cannizzaro reaction. One molecule of aldehyde is reduced to the corresponding alcohol, while a second one is oxidized to the carboxylic acid.
The applicability of Cannizzaro reaction in organic synthesis is limited as the yield is not more than 50% for either acid or alcohol formed.
In case of aldehydes that do have α-hydrogens, the aldol condensation reaction takes place preferentially.
The α,α,α-Trihalo aldehydes undergo haloform reaction in strongly alkaline medium. E.g. Choral will give chloroform in presence of an alkali.
Mechanism:-
The Cannizzaro reaction is initiated by the nucleophilic attack of a hydroxide ion on the carbonyl carbon of an aldehyde molecule by giving a hydrate anion, which can be further deprotonated to give a dianion in a strongly alkaline medium. Note that, in the second step, the hydroxide behaves as a base.
Now a hydride ion, H- is transferred either from the monoanionic species or dianionic species onto the carbonyl carbon of another aldehyde molecule. The strong electron donating effect of O- groups facilitates the hydride transfer and drives the reaction further. This is the rate determining step of the reaction.
Thus one molecule is oxidized to carboxylic acid and the other one is reduced to an alcohol.
When the reaction is carried out with D2O as solvent, the resulting alcohol does not show carbon bonded to deuterium. It indicates that hydrogen is transferred from the second aldehyde molecule, and not from the solvent.
The overall order of the reaction is usually 3 or 4.
The Cannizzaro reaction takes place very slowly when electron-donating groups are present. But the reaction occurs at faster rates when electron withdrawing groups are present.
Crossed Cannizzaro reaction: When a mixture of formaldehyde and a non enolizable aldehyde is treated with a strong base, the later is preferentially reduced to alcohol while formaldehyde is oxidized to formic acid. This variant is known as crossed Cannizzaro reaction.
E.g. Benzyl alcohol and formic acid are obtained when a mixture of benzaldehyde and formaldehyde is treated with alkali.
And Many other aspects of this reaction has been discussed in details.
--------------------------------------
Sodium Borohydride in Organic chemistry
• Sodium Borohydride in ...
LiAlH4 in One Shot
• LiAlH4 in One Shot | C...
DIBAL_H in organic chemistry
• DIBAL-H in Organic Che...
Most expected and important Questions in Physical chemistry
• Most expected and impo...
Most Important & Expected Questions for JEE NEET 2019
• Most Important & Expec...
Most Expected Questions for JEE and NEET 2019
• Most Expected Question...
Bent's Rule | Chemical Bonding |
• Bent's Rule | Chemical...
Inert Pair Effect | p-block Chemistry |
• Inert Pair Effect | p-...
Back Bonding in Chemistry |
• Back Bonding in Chemis...
Tricks for dpi - ppi Bonding | Explained by IITian |
• Tricks for dpi - ppi B...
Trick for Bond Angle | Developed by IITian |
• Trick for Bond Angle |...
Banana Bond in chemistr
y • Banana Bond in Chemist...
Heating of Salt:
• Thermal Stability of S...
Tricks for Hydrolysis of p Block Compounds
• Tricks for Hydrolysis ...
Tricks to Remember p Block Reactions
• Tricks to Remember p B...
Oxides of Phosphorus | Tricks and Techniques |
• Oxides of Phosphorus |...
Inorganic Reaction Mechanism | Tricks and Concept |
• Inorganic Reaction Mec...
We hope this would be very benificial for you guys.
Thanks
Keep Sharing….Keep Supporting!!!!
MKA Sir
Crystal clear concept
Oo...the most powerful video on cannizaro😍😍😍😍
Thanks.. 😊👍
best video.......
thanks sir.......
Thaank you sirrr.. U r a blessing for us (jee advanced aspirants and even other students).. May God grant ur every wish...
Keep doing hard work. 😊👍
@@IITianexplains Brilliant man. Just out of the world.
@@kv_clips rhnbl83i3
Sir please make a video on ISOMERISM IN COORDINATION COMPOUND ........... Please sir !!!!! Please!!!!!................
This is very nice video as usual....
Yes sir crystal field theory and isomerism
Sir u r awesome
Keep Sharing... Keep Supporting!!
Sir ji tushi great ho app teacher's of the teacher ho.Aissa concept to koi ruppe dai Kai na batay love you sir ji
Very good and exclusive questions sir
sir you are just amazing and dedicating
Excellent 👍👌 sir........... Keep It Up....
Thanks alot sir❤❤
Sir stereochemistry bhi sir???
Plz.. reply
Ok. 😊👍
Soon.
Finally.... thank u sir...
Sir you are great . Thanks you so much.
25:35 There was an alpha Hydrogen present along side C=O. So Aldol Condensation should have took place. Sir then why did you performed Canizzaro rex.
Thanks sir such a supporting video concept booster
Keep Sharing... Keep Supporting!! 😊
Who the hell dislike this magnificent lecture. Best lecture on Cannizzaro that I had ever seen.
Thanks Sir. 😇
Dislikers are mofo asshole.
Hehehe...😁😁
They are tuchiyaas who even dont watch our videos.
Because as a learner I can say that this content is optimum.
Inse kuch nhi hoga. 😁
@@IITianexplains tuchiyaas after some jumble it's chutiyaas.. 😂😂
You're awesome sir .
@@IITianexplains sir didnt even hesitate
Sir 9:50 me B to C ke conversion me aldol rxn bhi toh ho skta hai kyuki B ke pass alpha H hai.
Beta, Look Carefully. 😊
We aren't using here dilute NaOH.
Given alkali is concentrate here.
Best Best Best Best Best Best Best Best Best Best Best Best Best Best Best Best lectucture of youtube
"BOOM-BOOM" Concept!!
I'm preparing for JEE MAIN AND ADVANCED For 2020. I'm a dropper.
I accidently got your channel and shocked😮. I started to watch your videos even I have joined a coaching class. I love chemistry because it is related to NATURE and GOD!! And you made it easy for me.
You don't only teach CHEMISTRY but also VISUALIZE the LAB ENVIRONMENT while studying.
........
🤐
🙏
Thankyou so much
Thanks sir so much.....keep helping....
Sir 8:10 Double bond ka acidic hydrolysis bhi to ho sakta tha na sir vo kyu nai hua
u are amazing sir❤️🤩
The best thing someone can give is time…. Coz the time you give’ll never cum back… thanks for giving us a beautiful gift…❤️
SIR ONE VIDEO ON Sn1 VS Sn2 VS E1 VS E2......[Pls
Ok. 😊 👍
Amazing sir apka style baut aacha hai pdane ka
Boom boom concept ♥️♥️♥️♥️
God bless you sir! Aap aisa kaam kar rahe ho jiski jitni taareef karo utni kam hai!! Thankyou so much for providing us with such a quality content!! 😀🙏👏👏
Thanks 😊
Keep Sharing... Keep Supporting!!
Always sir!🤗👍
Awesome Sirrrrr!!!!! Yeh 5 ques karke mast feel aayi....😍😍😍
Thankuh guruji🙏🙏🙏🙏❤️❤️❤️❤️
Sir is genius
Keep Sharing... Keep Supporting!! 😊👍
Sir biomolecule ka video dalo
Sir 25:34 mein aldol kyu nhi ho raha hai bade waale grp ke paas go alpha h hai
Sir plz tell me how to find your lecture videos on unacademy plus aap
*air why in last question attack was on OH 1degree jubki ester wala O is more stable donor*
There is no ester here.
And condition is demanding such protonation. 😊
Ether***
sir aap bahut achhe hai..
best video i ever watched on u tube
tysm sir.
Thanks. 😊
Keep Sharing.. Keep Supporting!!
Sir please upload video on examples of sn1 sn2 e1 e2 jee advance
Please upload these video .....more ..I am big fan.
And... thnquhh sir...uuh are a boon for uss...!! May god fulfill all urr wishes🙏🙏
Sir please make videos comprising of whole chapter .....Please sir🙏🙏🙏🙏🙏🙏
Sir, you represent the mechanisms so clearly that no doubts are left after watching....Thank you sir....
Sir, Paramethoxy benzaldehyde and Paranitrobenzaldehyde ka crossed cannizaro reaction ka product kya hoga?
Sir kon a66a hydride donar ha....... Iska kya Criteria ha?
really awesome sir
Love you sir thank u so much
Sir ,first question me aldol reaction ho sakta he due to alpha hydrogen
Base dekho..conc NaOH h. Dilute nhi h.
@@IITianexplains but acid base reaction is very fast reaction thn nucleophilic addition.
Thank You MKA Sir!
These 5 Questions have made Cannizaro Reaction Topic Crystal Clear From JEE Advance Point Of View.
Perkin Rxn or JEE Adv Favourite Rxn Mech Type Ques Can be Next Video Suggestion.
Thank You Sir For Dedicated Efforts!!
Ok Sure. 😊👍
Sir you are evergreat
Sir acetal can't not stay in aqueous acid medium... and in k2cr2o7 we use aqueous acidic media to oxidize ... ?
Thanks sir again ......
Sir plz biomolecules plz
MKA sir P-block par eik oneshot video dejiye Naa sir..4-5 questions of NEET target hoonge iss video.hope u will think upon it
Ok. We have noted your request.
But p block is very huge...single shot me sayed na ho..but me try krunga.
Best sir
thank u so much,sir
Thanks a lot sir
Sir third question ke last step me kuch jyada lag rha hai acidic hydoly.. me itna bhaynkar esterification kaise ho sakta hai
Aldol con. Vale video se bhi super vala tha sir mza aa gya super se uper duper wala video tha. Concept boom boom ho gya hein !!!! 🙌😘😇😀😊 thank you soooooo much sir !!!
Thanks 😊 👍
Keep doing hard work.
Sir , is ethylene glycol ka use target specific medicine bannaane mein kr skte hai?
Amazingly fantastic(especially the last question:) ) video sir but just 1 doubt in the 4 th question, Why are we performing esterification as stereochemically the acid and alcohol are in different plane, Moreover heat has not been mentioned which is required for esterification reactions. Also the same type of question is there in Jee advanced 2003 (Or IITJEE) and the answer there is mentioned that before the esterification was performed. Thank you sir !!!
In this lecture sir illustrated THE BEAUTY OF ORGANIC CHEMISTRY
Shukriya sir.
This channel should have millions of subscriber.
Sir 1st ques me to wha par Alpha H hai, to fir cross aldol bhi to ho skata tha??, lekin conc. ke karan cross cani karaya, am i right?
Sir tysmmm 🙏🙏🙏🙏🙏 sir don't stop this series till advance it really helps a lot ....
Sure. 😊👍
Hattttttt😡😡😡😡😡😡
Watched both Aldol and Cannizzaro video. Both were too amazing.
Thanks. 😊👍
Keep doing hard work.
One of the best chemistry teacher.sir aap ki methodology bahut achi h theory vgrh na Kara Kar questiona se concept clear Kartey Hein👏👏👏mne meet 2020 ke liye bhi apke kuch lectures dekhey they and sir mere 150 aye they chem me par physics ke Karan Mera selection nahi hua but sir this time I want 175 in chem.shayad kuch logo ke liye apke lectures jayada tough ya bhar ke hongey but for me apkey lecture best hein.thanks sir❣️❣️❣️
#myopinion. I love you sir jh sir ke baad aap mujhe achche lage hai chemistry ke liye. Thank you sir for these video
heating of sodium formate shayad ncert me nahi hai.
Guruji apke kya kehne aap to organic ke legend ho best cannizaro video 👍👍
sir last question thora tarka tha
Questions are unflinching....🔥love u sir
Sir are you the same MKA sir on unacademy?
No words can ever explain ur greatness bt as usual thankyou so much sir😘
Thanks 😊
Keep doing hard work.
Sir what does HCHO/H+ do?
Tq so much sir
At 5:33 why K2 cr2 o7 does not oxidize double bond
Sir aap bhaut mast padhate ho...Esehi jee Advance level Ka padhate rho
*if u see constant number of dislike in each video u know what it is*
Yes..I know..
हमारे सुभचिन्तक बढ़ गए हैं । 😁😁
@@IITianexplains lol sir
Supar see bhiii upaarrr..
Thanq..Sir..Jii..😍😍😍😍.
I like your video before watching.
I give you a title of 'Mother Teresa' ,
A high benevolent and compassionate character. In modern era who wants to help others for free , my 'Mother Teresa' .
Thanks. 😊👍
Sir in Question no. 4
Both rings are not in the same plane.
They can't lead to the formation of Ester.
Kindly review it please
Agar same plane m hai hi nhi to Ester nhi ban skta hai
@@Kumarvishal120 I also have the same doubt, you can refer the above comment, What do you think?
🙏🙏
Sir qualitative analysis is important for neet?
Sir when Perkin rxn video
The only youtuber who is famous but still replies to comments
Hats off....
Sir second ques main Fe tube honiye chahiye na?
Why will it not attack double bond please explain 6:35
sir love from pakistan sir itna intersting content kbi nahi dika
Sir plz make video of some multiple reactions question of organic...as in jee 2018 most questions were in this format...
Sir plzzz make it will be beneficial for all students giving jee adv
GOD OF Chemistry
Excellent
Thanks sir
Keep Sharing... Keep Supporting!! 😊
Best video ever ..really awesome cannizaro ke saath hi itne saare multiple concepts aur badhiya ques bata doge sir apne thanks a lot sir
Keep Sharing... Keep Supporting!!! 😊
Boom boom ⚡⚡⚡
Guruji pranaam me aapka regular student hoon plus par aaj cannizzaro revise krna tha or ye purani videos nahi dekhi thi guru ji opp sessions the hain or rhenge thnkuuuuu guru ji ❤️❤️
Sir there is one mistake you have done
K2cr2o7 also cleavages double bond and in the 1st question you have not broken the double bond @IITian explains
Sir one more think i wanted to ask
Sir in the 4th question the esterification should not take place as because there is ch2oh and cooh in the ortho position of the diphenyl system will rotate rotate and no esterification will take place.
This ring rotation concept is in the stereoisomerism topic.......
K2cr2o7 don’t oxidizes alkene acidified k2cr2o7 do!
40 mins kaise nikal gaye sir pata hi nhi chala... Great lecture sir... 🙏🙏🙏 ...★★★★★....∞
Sir last wala question me to salt bana hay usme ek oxygen I am hay ring me..
Nice explanation
Sir aap awesome ho... Aapke jaisa koi Nhi padha sakta h... Sir, kya aap inorganic bhi padhate ho??? Agar padhate ho toh plzz aap d and f block elements aur coordination compound ka isomerism par video bana dijiye... Thanks a lot for the efforts that u put in the video...
Awesome 👌