JEE Main 2016 · 10 Apr · Shift 1 · Chemistry Q58

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ChemistrySingle correct+4 / -1Question 58 of 90

The "N" which does not contribute to the basicity for the compound is :

Purine with its atoms numbered: N1, C2, N3, C4, C5, C6 in the six-membered ring and N7, C8, N9 (bearing H) in the five-membered ring.

N 7

N 9

N 1

N 3

Answer and worked solution

Official answer: B

N9 carries the H and its lone pair is part of the aromatic sextet of the imidazole ring, so it is not available to accept a proton. N1, N3 and N7 have lone pairs in the ring plane.

Topics:Acidity and basicity Aromaticity

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JEE Main 2016 · 10 Apr · Shift 1, Chemistry question 58