12 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.just generally confused ill stop yapping
Increasing pKb is decreasing basic strength.
Highest is 1st because 3° amine and OCH3 increases electron density on N by +R.
CN and OH in meta both reduce reduce electron density by -I.
So they're last, 2 is second.
CN is a stronger -I group than OH so it's last. 1,2,4,3 should be the order
That's uhh option 1
Yup, it's option 1 according to what you sent as well
ah oke
@Nimboi
typically we assume secondary > primary > tertiary right
my teacher told me to assume aqueous medium where not mentioned (its worked in previous questions)
due to solvation effects, the order changes
It depends on the amine. Don't bother memorising the order, just remember the logic.
yeah i get that, but solvation effect is also a legit logic
due to which the order can change
It's basically a competition between steric hindrance and electronic effects
Plus, that order only applies in the absence of aromaticity or resonance, and usually only for aliphatic compounds. Cyclic systems are a whole new can of worms. But since you have resonance here, electronic effects take priority.
Did you get it?
Ah ok that makes sense
Because I just looked it up and in solvation effect, a major factor is the small size of a primary amine
Which doesn't really apply when there's a big ring attached to all of the options
Thanks :)
+solved @Opt
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