Which of the following is most basic?a)b)c)d)Correct answer is option 'C'. Can you explain this answer?

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Lone pairs of nitrogen atoms, give a correct resonance pattern

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Basicity mean loan pair donating tendency of loan pair,these all are ligand and all have 2 nitrogen atom in it.In option b both the nitrogen atom are separated by a ring and have distance between them..that same problem is seen in option a too..and in option D both the nitrogen atom are in opposite side hence it would be difficult for both of them to share loan pair simultaneously.....But in option C both the nitrogen atom can share loan pair of electron simulataneosly ..hence correct answer is C

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In option C the two N atoms are more close to each other.Due to presence of close enough there a possibility lone pair - lone pair repulsion between the two N atom.so to avoid such repulsion they shows higher tendency to donate its lone pair towards a proton.

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In Structure c all three benzene rings have aromatic character hence nitrogen on these rings are more stable and electrons will be easily available for donation.

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Option C is correct and yes the lone pairs on N are localised and in hybrid sp2 orbital According to me there is a more better answer.when one one of the lone pair on N accepts H+ then due to H bonding with lone pair of other nitrogen it kinds of stabilises itself.These are basically called as PROTON SPONGES if I not wrong

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Lone pair of nitrogen are not far apart they close to each other that is why resonance in ans. 3 is maximum

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Because option 'C' is a sponge base, and sponge bases are very basic in nature. Intramolecular H- bonding is also possible there.

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C is most basic as the 2N are closer to each other so as the lone pair on them.These 2 lone pair will impose more repulsion on each other and will be out of plane of conjugated system.So will be more available for accepting proton and hence more basic.

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Correct option c donerted two lone pairs of Nitrogen

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C

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Calculate the resonance structures for each and look which one has less number of then that is more basic

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The correct answer is option C because the lone pairs on two N atoms are very close to each other and due to this steric inhibition of resonance, N is not able to donate its lone pair for resonance with the ring and can only donate it to form Lewis acid-base adduct.

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In option c, both the lone pairs repeal eachother,so they go out of the plane and can not delocalize

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C is ans due to both nitrogen are in. closer contact so created a repulsion in lp so easily donation of lp occurs and it's is a proton scavenger also

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Option c is an example of proton scavenger.After protonation lp-lp repulsion decreases as well as it is extra stabilized by H - bonding also

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C...becoz..lone pair of nitrogen.

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Stronger the base weaker the conjugate acid thus stable the conjugate acid so u can see in option 3 the acid is more stable due to more possible resonance structure after the attack of a proton to any nitrogen so c option is correct

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I think Option A is correct. because all 4options are aromatic ring and the nitrogen lone pair is available for donation. so we have to consider the electronegativity on comparison Option has the Nitrogens far apart and sterically free

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Becoz tere N is sp2 hybride and lone pair of N is also in sp2 orbital there energy of lone pair is too high so donating tandany is too high and 1-4N is to closed so replation a other factor for more basic

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Due to delocalization acidity increases then how the answer B is right.by closer nitrogens acidity will increases

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Due to the repulsion between the lone pair of nitrogen

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D

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In  option C both nitrogen atoms are closer due to this  lone pair repulsion increases so , donating of electron is more so, it is more basic ..

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Correct answer 'c'  because in the 'c' option nitrogen atom  are show resonane  due to the presence of lone pair of electron  on nitrogen atom.in the 'c' nitrogen atom are  close  each other .so these are more basic

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In option c there is severe lone pair repulsion between 2 N atom, hence one N take up a proton which involves in H-bonding with another N atom due to close proximity

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Lone pair of nitrogen are near to each other. similar charge near to each other means stability more. so. that bascisity is also more.

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C becoz lone pair of nitrogen

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ANS-D

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