I
iTeachChem2mo ago
nori

oc mesomeric effect

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17 Replies
iteachchemhelperv2
@Dexter
iteachchemhelperv2
Note for OP
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Prachi
Prachi2mo ago
Yes, it's correct 1,2,4,5,7,9 have lone pair So, can participate in resonance
nori
noriOP2mo ago
ah okay yeah i just wanted to confirm thanks a bunch we only look at the atom directly attached na.. like even if there's a withdrawing grp after it we wont look at it like nhcoch3
Prachi
Prachi2mo ago
Yeah It's like cross conjugation
Real potato
Real potato2mo ago
It will still show +M effect although uska intensity kam ho jayega kyuki like in this case Nhcoch3 nitrogen ka lone pair resonance krne lgega Carbon ke oxygen k sath
nori
noriOP2mo ago
right, got it.. and +M bw OH and OCH3 how do i compare
Prachi
Prachi2mo ago
OCH3 mei CH3 ka +I lagega to oxygen ki electron density badh jaegi to vo zyada +M show karega as compared to OH
Varun_Arora
Varun_Arora2mo ago
Ahmm actually this is wrong OCH3 has a larger bond angles Because of steric repulsion of the CH3 by the rest of the carbon chain This increases %s character in the oxygen in the OCH3 Which increases its electronegativity (Bent's Rule) Because of this, it doesn't donate as much as OH Do you guys get this? @Prachi @ns @Real potato
nori
noriOP2mo ago
yeah.. cuz i solved a problem where oh was considered to have more +m thanks so much
CorrodedCoffin
CorrodedCoffin2mo ago
also cl ka toh -i dominate karta hai na
Prachi
Prachi2mo ago
Yep, forgot about the repulsion factor
Varun_Arora
Varun_Arora2mo ago
Actually the problem is that alkyls are actually not +I groups So I kinda refrain from using that in my explanation 🙂 (it's been proved recently) #💁│general
Real potato
Real potato2mo ago
yup i understood ur point about bents rule
CorrodedCoffin
CorrodedCoffin2mo ago
..?
flower
flower2mo ago
welp cant wait to have that added into NCERT 8 years from now :DD
nori
noriOP2mo ago
yeah. like it shows both +M and -I but we consider -i

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