The colour of Cr2O72– changes from orange to blue-green when added to compound (A). The blue-green colour is due to the formation of :

Engineering

Chemistry

Balancing of Redox Reaction

Types of Redox Reaction

Dichromate and Permanganate Ion Reactions

Question

The colour of Cr₂O₇^2– changes from orange to blue-green when added to compound (A). The blue-green colour is due to the formation of :

Cr²⁺

Cr³⁺

CrO₄^2–

CrO₅

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DU in

A = \frac{(2 n_{C} + 2) - 2_{H}}{2} = \frac{(2 \times 9 + 2) - 12}{2} = 4 °

(It shows a benzene ring which is also confirmed by the oxidation of (A) to benzoic acid (PhCOOH)).
(I) The reaction of Na with (A) shows that it contains (– OH) group.
(A) is chiral, so the possible structures of (A) can be
(II) will give iodoform test.

But compound (A) does not give the iodoform test. So the structure of (A) is (I).