23please keep this post alive!!!
This thread will focus on some very basic things of organic chemistry. They mainly will help to solve problems that are based on passage type questions.
Feel free to contribute.
Please do not post everything in a single post.. I wud rather say that post concepts one by one. Otherwise it becomes waste.
Note: I will delete all useless posts like "thank you" and "this is great" so that there are only relevant posts on this thread. None the less post them to express your thoughts so that we all know that someone or the other is benefitted.
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19 Answers
1par questions ke liye ek hi thread ??
wont it bcome dirty?? i mean i thot so :(
1can smeone explain when and how does ring expanison occur ?? Thanks in advance !!
1the most important method is to know the mechanism
first if doing quantative analaysis we should konow basic stoichiometry
and for roadmap problems we should always know the basic action of the reagent like LiAlH4 reduces an acid
but NaBH4 does not though there in the same group
THE Answer is (b), (a), (b) is it not
9solving paragraph Qs in organic
this time JEE 09 had a paragraph Q
there were 3 sub Qs
the 1 and 2 sub Qs had many possible correct options
but the 3rd sub Q had only one possible ans
so jee expected ppl to first find ans for 3rd sub Q , then work backwards to find corresponding matching ans for 1 and 2
ill post that Q now
3Study the name reactions only within the syllabus.(Nishant sir told me)
Personal experience:
Start from basics.
Thorough with the basic mechanisms proton transfer,hydride shifts,and methyl shifts.
We have to be very thorough with reactions wat is given in NCERT buks.
Dont get confusd by using foreign authors as most of the content were not needd.
1deleting posts should be a job of admin only and of originator of the thread
62@sky... lets try this out..
I think the best way will be to reply to the same question there itself.. ofcourse after a bit of discussion.
So that way when users come in the future, they wont have any issues.
THe other posts if irrelevant can be deleted from time to time.. either by me or by the users themselves!?
11Understanding mechanism is the key to modern organic chemistry although we will be studying hundreds or thousands of reactions, these reactions occur via only a few fundamental mechanistic path ways. It is the recognition of the mechanistic similarities between different reactions that allow organic chemistry to be readily understood. Understanding mechanism will help make sense of thousand of facts that comprise organic chemistry.
106gud bhaiyya thx this wil really help me as im VERY weak in organic... thx again bhaiyya...
1WAISE BHAIYA ONE DOUBT ..
did u ask about such kinda contributions ??
or roadmap questions ??
11always work out as much problems as you can it will help you to understand the concepts & reaction mechanism more effectively..
Write the reactions and mechanisms more than just merely having a look over them..
1contribution 2:
if the molecular foermula of the comp is given...
without thinking anything else... find out the UNSATURATION FACTOR.
1contribution 1 :
1) if it is told the compound is not sol in NAOH => comp is not acidic (it doesnt imply dat the comp is alkaline)
2) if it is told the compound is not sol in HCl or H2SO4 or any given particular acid => comp is not basic (it doesnt imply dat the comp is acidic)
3) if its told the comp is soluble in water => comp is polar in nature.
11Read the complete ques 1st, & figure out if there is any increase or decrease in carbons.Then look at the options.Many a time,you will be eleminate options on the basis of no. of carbons in the expected product.This will help in saving time.
BUT the ''most important tool'' : REACTION MECHANISM.
11)Don't forget chemical bonding concepts like 2nd period elements don't form more than 4 bonds . seems elementary but ppl make a mistake here
2)Don't blindly tautomerise.
3)Sometimes it's worth counting the number of carbons or atoms .
it's JEE generally options can't be ruled out so easily .
but if you can't figure out this is also a sometimes convenient method
4) always try to find the acidic site , basic site. then neutralise .
or electrophilic site and nucleophilc site and react them
if you find many sites check which is most reactive and for writing the product check how stable the intermediate is or how stable the structure which you get next is ?
62The question says that there is only one mono-substituted product on a benzene derivative.
Also, the derivative itself has 2 carbons with some attachment to it.
Then what will be the possibilities?
these are the three possibilities..
here you should realise that for the 1st one there are 2 kinds of mono substitutents possible.
for the 2nd one there are 3 types
and for the last one there is 1 type..
Here by substitutent, I mean something attached direclty to the benzene ring not the R group
Please notice that these are fundamental things.. so dont be excited ifyou know already. I am only trying to help guys. specially eureka who had this issue.