plz expalin this question .... Hs chs , agoh ch 2) heat60 h 3. rans-cyclooctene cis-cyclooctene

See the mechanism.

Since cyclooctene can exist in cis & Trans form Hence the product.

If the reactant happens to be cylic ring of less than 8 carbon then only one product i.e cis will be formed. As Trans don't exist

plz draw mam

See

I didn't get

Trans cyclohexene doesn't exist. So only product. But Trans cyclooctene exist so two products

Sweta now?

ok mam

plz tell is it e1cb elimination ....

yes

Whenever there is poor leaving group E1cb occur

mam but n (ch3)3is good leaving group

check it Shweta. hope you will got it

plz draw this on page sir

reaction??

yes

I have sent u the question

yes

plz tell is it e1cb elimanation

E2 elimination

it is good leaving group so gives E2

The E1cB elimination reaction is a type of elimination reaction which occurs under basic conditions, where the hydrogen to be removed is relatively acidic, while the leaving group (such as -OH or -OR) is a relatively poor one. Usually a moderate to strong base is present.

got it??

ok sir

but sir

If it's e2tgen why there is negative charge on carbon and why leaving group is not leaving plz see the structure

see what happen actually in this reaction...i think you know this part

this is know sir ...plz solve this question..

?

yes shweta wait...i m solving...i was busy in some work..sorry for late

it's okay sir

and sir plz tell is it e1cb elimination ???

shweta in e1cb emilination..there is formation of stabilised carbanion

here it is carbanion like transition state...and in e1cb always hoffmann products forms..and in e1 always saytzeff product and in e2 mixed.....i have explained this as due to bulkiness of this group here hoffamnn favours...you have seen this is newmann structure

ok sir

means it is a e1cb

because first proton leave then after leaving group

but sir n(ch3)3is good leaving group then how can this be a e1cb

shweta you have do this mechanism here bulkiness of leaving group comes into play

yes sir

so it's e1cb although good leaving group but bulkiness dominates

yes shweta...

thanku sir

sir but in some books it's written that it's e2 that 's wrong n?

this sir

shweta..see i have written above that in e1cb there is formation of stabilised carbanion but here it is carbanion type transition state formed...and in e1cb hoffmann doninates...and in e2 mixed..so you can say it e2 type in which hoffmann products formed

ok sir 👍👍