Aryl Halides and Phenols - Result Question 14
####17. For the identification of $\beta$-naphthol using dye test, it is necessary to use
(2014 Adv.)
(a) dichloromethane solution of $\beta$-naphthol
(b) acidic solution of $\beta$-naphthol
(c) neutral solution of $\beta$-naphthol
(d) alkaline solution of $\beta$-naphthol
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Answer:
Correct Answer: 17. (c)
Solution:
- PLAN This problem can be solved by using the concept of synthesis of dye using electrophilic aromatic substitution reaction.
In basic (alkaline) solution naphthol exists as naphthoxide ion which is a strong $o, p$-directing group.
III
Thus, formation of dye can be shown as
Thus, (d) is the correct choice.
