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JEE Main2026Jan 22, Shift 1Chemistry
Q.

The formal changes on the atoms marked as (1) to (4) in the Lewis representation of molecule respectively are

  1. A

    +1, 0, 0, –1

  2. B

    0, –1, 0, +1

  3. C

    0, +1, 0, –1

  4. D

    0, 0, –1, +1

Solution

Apply to each labelled atom.

Atom 1 (O bonded to H and to N by single bonds, 2 lone pairs): .

Atom 2 (central N, three bonds: one single to OH, one double to O(3), one single to O(4), no lone pair): .

Atom 3 (O doubly bonded to N, 2 lone pairs): .

Atom 4 (O singly bonded to N, 3 lone pairs): .

So the charges in order are .

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