It is antiaromatic and on losing a proton the nitrogen will have no positive charge left on it making it more stable. So it can easily donate proton in comparison to any other compound of other options.
Compound c &d are already aromatic..so after losing proton they will not get any extra stability,but compound b is antiaromatic so after losing proton it will get stability as it becomes aromatic..on the other hand compound a also don't get any stability after losing proton like compound b..thus compound b is most acidic
Initially 'B' is antiaromatic due to absence of lone pair on N. On loosing the 'proton', the N takes up the bonding electrons and thus the conjugate base becomes more stable due to gaining of aromaticity by becoming a 6 pi electron system.
With releasing hydrogen,the compound is become neutral & then the lone pair of nitrogen is participate in resonance & .The compound is become aromatic and increase the stability
B after releasing one proton will get aromatic pyrrole ring where the lone pair of nitrogen involved in conjugation.for c&d no need of N lone pair for arometicity.
Since nitrogen has postive charge and there is resonance possible due to pie bond in the ring and there is no Me group to increase tha + I effect so this is most acidic among these
This discussion on The most acidic species is:a)b)c)d)Correct answer is option 'B'. Can you explain this answer? is done on EduRev Study Group by Chemistry Students. The Questions and
Answers of The most acidic species is:a)b)c)d)Correct answer is option 'B'. Can you explain this answer? are solved by group of students and teacher of Chemistry, which is also the largest student
community of Chemistry. If the answer is not available please wait for a while and a community member will probably answer this
soon. You can study other questions, MCQs, videos and tests for Chemistry on EduRev and even discuss your questions like
The most acidic species is:a)b)c)d)Correct answer is option 'B'. Can you explain this answer? over here on EduRev! Apart from being the largest Chemistry community, EduRev has the largest solved
Question bank for Chemistry.