How many atoms (carbon, nitrogen, oxygen and fluorine) are conjugated in ciprofloxacin (circle the conjugated atoms; one circle per atom) ?

Question

TestHub · Accepted Answer

Quinolone ring system : N-1, C-2, C-3, C-4, C-4a, C-5, C-6, C-7, C-8 and C-8a = 10 atoms; C-4 carbonyl O = 11.

Carboxylic acid group : C, =O and -OH oxygen = 14.

F on C-6 (lone pair conjugated with ring) = 15 ; piperazine N attached to C-7 = 16.

Answer = 16.

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