A) ?NO
B) ?N=N?
C) \[N{{O}_{2}}\]
D) \[N{{H}_{2}}\]
Correct Answer: D
Solution :
The intrinsic colour of the organic compound is due to the presence of certain functional groups containing multiple bond in their molecular structure called chromophore e.g., nitro \[(-N{{O}_{2}}),\] nitroso \[(-N=O)\] azo \[(-N=N-)\]etc. Auxochromes are functional groups which do not impart colour to the compound but intensify the colour of the compounds if present along with the chromophores e.g., \[-OH,-N{{H}_{2}},-S{{O}_{3}}H,-COOH\]etc.
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