Hydrocarbons 04 : Preparation of Alkanes 04 : Soda Lime - Decarboxylation JEE MAINS/NEET

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Preparation of alkanes Soda-lime method 2:39 4:36 Descent of chain 7:13 Important 12:04 Mechanism 13:58 *19:46** - **21:30* Intermediate and RDS 17:05

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5:16 sir one more method by which methane could be prepared and which have you have already taught is alkyl halide CH3-Cl+H2 in presence of Zn +dil HCl will yield CH4+HCl

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29:50 part c aromatic nhi hai becoz continuous conjugation nhi hai ring mai so it is non-aromatic compound...it has extended conjugation than b ..

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I dint get it ? Please expain ! That line pair will go inside the ring and form fully aromatic compound only right !

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11:08 Q1 (rate of decarboxylation) 13:48 decarboxylation mechanism 21:47 Q1 answer 24:10 Q2 27:02 Q3 28:47 Q4

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AT 29:56 if C is aromatic then B is anti aromatic cuz it has 4 pi electrons which is highly unstable and C can not be used as substrate as COOH shows -M effect which causes the ring to not have the 2pi electrons of oxygen, which causes the ring to have only 4pi electrons.

[@trinanjan26]

B can never be anti aromatic since no extended conjugation, no planar form..... -M of C=O will not effect the ring since no π bond at [1,2] position of ring hence no extended conjugation

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For screenshot 3:15 7:30 10:31 20:37 26:56 30:01

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Descent of chain🔥🔥

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Sir, last question me third compound ke negetive charge se kaise double bond bana?? Please reply sir, I can't understand.

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Maybe, because a negative charge means a lone pair and the tendency of the compound to attain aromaticity makes the lone pair into a Pi Bond thus making the compound stable and aromatic.

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its wrong compound infact i was about to post the same!!!!!!

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@@aintgonnamind5505 may be its anti aromatic compound and anti aromatic compound are highly unstable so sequence should be c>a>b

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@@aakankshasinghthakur6736 Order is correct c>b>a because c has more resonating structures than b and a is not showing any resonance.

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Sir a question about isomerism how to tell the no. Of isomers without drawing them ? Any trick easier than DBE

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Use of CaO in soda lime reaction is same as my contribution in group project 😄

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no

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[@faisalafzal7786]

Last question,question no 4 'c' is not aromatic. Rather it has extended conjunction which is more stable than cross conj(b)

[@arianlili7252]

Exactly,I was a little bit confused on why he did it so I came to see if it was a mistake

[@arianlili7252]

For aromaticity, the conjugation should take place in the whole ring with (4n+2)π electrons involved

[@adityaprakash8393]

Sir CaO is a strong dehydrating agent so what will be the possibility of having water in the reaction mixture after all whole point of lime is to dehydrate so I'm really doubting the carb anion attacking water part of the mechanism you have, ... Though there could be some water but there is another reaction of benzylic acid with a chlorine on the adjacent carbon ... rather than taking a H+ at the carbanion step , it forms triple bond when Cl- leaves due to unavailability of water ... and plenty heat is there for stabilisation of the unstable species .... that triple bond ring dimerizes afterwards... So how do we know when does dehydration takes place and when not

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28:07 negative charge ki shifting ke baad toh usme bhi resonance aa jayga na?

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[@dheeraj7386]

but at 30:00 'B' as 4 pi electrons which will lead to the formation of anti aromatic compound. So the order must be C>A>B..❓❓❓

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3:13 SS1 7:33 SS2 11:19 Q1= 23:12 SS3 24:52 Q2 26:12 Q3 28:55 Q4

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[@meli_senpai]

Sir what is the use of CaO in the reaction if it doesn't serve as a catalyst or anything

[@yogeshmyadaram9139]

CaO in sodalime is to keep NaOH dry since it is quite hygroscopic in nature

[@farah5124]

It facilitates the removal of co2 from the salts (CaO+CO------>CaCO3)

[@Ash-rx5wl]

NaOH is a deliquescent substance and if used alone, causes cracking of the glass test tube. So, Cao, being a good drying agent, prevents that. We even studied this in class 10, if u were in ICSE, it was given in Concise and Dalal's books.

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[@Punjabei]

CaO is the best compound that absorbs Carbon dioxide

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Sir ek doubt hai ki last question me b wala anti aromatic compound ho gya to rate c a b hona chaiye

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[@Thor-ur6kp]

Sir i go to allen but in my module the reaction mechanism is different. OH- from NaOH attacks on RCOONa and forms R- and NaHCO3.Now R- attacks on H of Nahco3 and forms RH. So according to them the H is not from H2O it is from NaOH. Please reply sir.