29 Replies
@Dexter
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.Ans is (B).
I know that when Br2/Fe react, bromine attaches to ortho position wrt OH group. But here Br is in para wrt OH.
I know the correct ans is B but I also want to know why the other options are eliminated.
Many reasons I’d say
Firstly, A seems wrong because CHO is between OH and Me which is sterically unfavourable
Then for bromination it’s the same reason between Me and OH would be sterically unfavourable
Ignore the message before the edit lmao brain lag hogya tha
That’s not true tho para is major
A is wrong because
1. Steric hindrance
2. Even if steric hindrance didn't affect the Reimer-Tiemman reaction, the Bromine would be ortho/para to the the OH and Me groups.
C is wrong because OH and Br are both large groups, and there's a methyl group competing for space. Too much steric hindrance. Also, salicylaldehyde hona hai. CHO and OH should be ortho wrt each other
D doesn't even have an aldehyde group
@.aiglatson
Yep I eliminated C and D in the same way, as per reimer tiemann there needs to be CHO, and I felt CHO's position cant change when br is added
Forgot this bruh 😦
In an earlier question Br was added to ortho only.
Thank you guys
Funnily enough, for most reactions ortho is major product.
But para is symmetric and less steric rep so wont it be major?
21% para
79% ortho
Is the usual split
Theoretically yes. Experimentally, apparently not
Chem moment -_-
While doing haloarenes I came across 5-6 cases where para is major
Only when you have a huge steric hindrance like a t-Bu group is when para becomes major
Okay thanks bhai
Youre in 12th too?
Yup
Btw, source: Organic Chemistry, Paula Yurkanis Bruice, 7th Edition
🙏
You use this book as reference for OC?
One of them
I use that and Clayden,2nd edition
Wow great
Kaisa hai jee prep?
Miserable.
Sab kuch samajh aaya. Questions nahi ho rahe hai.
Bhai mai kuch ref book nahi use krta hun aur mera prep kaafi shit hai, I guess my miserable and yours are way apart 😭
Mera toh modules hi nahi hai yaar
D is a case of abnormal reimer teimann reaction (spelling ka pta ni lol)
Hydrolysis has taken place
Why?
Steric hinderance yea.
is this alright, can we close this thread?
Yes sir
+solved @iTeachChem
Post locked and archived successfully!
Archived by
<@1246069675842994236> (1246069675842994236)
Time
<t:1719640323:R>
Solved by
<@1035556259417571408> (1035556259417571408)
+solved @!Nimay¡
Channel is already marked 'Solved'.
+solved @!Nimay¡
Post locked and archived successfully!
Archived by
<@1035556259417571408> (1035556259417571408)
Time
<t:1719645986:R>
Solved by
<@553586861570916363> (553586861570916363)