I was done with my 12th 2 years ago. My sister is rn studying in 12th, and before I could explain to her I thought of revising myself. Couldn't have got it better anywhere. Wish I would find u much earlier.
Dear temperature for dehydration of alcohols ranges from 70°C to 190°C depending on the nature of alcohol taken. We however for general mechanism take 170 -180°C.
Dear free radical forms in case a single electron transfer occurs. In case of heterolytic fission only carbocation or carboanion brings more stability instead of free radical. For example if in CH2CH2OH2 the bond breaks homolytically we will get CH2' and 'CH2OH2+ one unstable free radical is formed and another charged radical is formed. The system became very unstable. But in case of heterolytic cleavage we get H2O which is very stable molecule and one CH3-CH2+ ion which still is more stable than CH2' so heterolytic pathway is energetically more favoured that's why it happens like this. Hope you would have got the answer
Dear temperature for dehydration of alcohols ranges from 70°C to 190°C depending on the nature of alcohol taken. We however for general mechanism take 170 -180°C.
Positive charge on oxygen further weakens the carbon oxygen bond and hence hight temperature easily break this bond heterolytically leading to the formation of ethyl carbonation.
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I was done with my 12th 2 years ago. My sister is rn studying in 12th, and before I could explain to her I thought of revising myself. Couldn't have got it better anywhere. Wish I would find u much earlier.
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very stepwise explaination
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@@Mychemistryteacher sir plz Hoffmann elimination ka link bhejo
Sir Hoffmann elimination ka link bhejo plz
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Step 3 is rate determining step and this is bronsted lowry 😊
Dear almost all the organic reactions involve acid base elementary step reactions ( protonation and deprotonation)
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140 170C tak karna hia sir explain me please
Dear In case of dehydration the temperature should be kept at 170°C
Fantastic video with great explanation
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Habibi
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Sir temp. 180°C?
Dear temperature for dehydration of alcohols ranges from 70°C to 190°C depending on the nature of alcohol taken. We however for general mechanism take 170 -180°C.
@@Mychemistryteacher Thank you sir! ❤
Best ever explanation
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Hello sir, thank you! I have a question, when CH3-CH2-OH2 bond broke in step 2, why did positive charge on CH2 form instead of free radical of CH2?
Dear free radical forms in case a single electron transfer occurs. In case of heterolytic fission only carbocation or carboanion brings more stability instead of free radical. For example if in CH2CH2OH2 the bond breaks homolytically we will get CH2' and 'CH2OH2+ one unstable free radical is formed and another charged radical is formed. The system became very unstable. But in case of heterolytic cleavage we get H2O which is very stable molecule and one CH3-CH2+ ion which still is more stable than CH2' so heterolytic pathway is energetically more favoured that's why it happens like this. Hope you would have got the answer
Temp. at 443K
Dear temperature for dehydration of alcohols ranges from 70°C to 190°C depending on the nature of alcohol taken. We however for general mechanism take 170 -180°C.
Sir step 2 me cleavage kaise hui
Positive charge on oxygen further weakens the carbon oxygen bond and hence hight temperature easily break this bond heterolytically leading to the formation of ethyl carbonation.
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How?
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