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# Which of the following groups is an auxochrome?

$(a)\;-N(CH_3)_2 \\ (b)\;-OH \\ (c)\;-COOOH \\ (d)\;All$
Can you answer this question?

Groups like $-OH,-COOH, -SO_3H, -NHR,-NR_2,-NH_2$ are anxochromic
Hence d is the correct answer.
answered Mar 7, 2014 by