Potassium cyanide is used for extraction of gold in the presence of air (O2). Native gold in a solution containing cyanide ion (CN-) forms [Au(CN)2]-. Which of the following option, is/are correct for

Question

Potassium cyanide is used for extraction of gold in the presence of air (O2). Native gold in a solution containing cyanide ion (CN-) forms [Au(CN)2]-. Which of the following option, is/are correct for extraction of gold from 0.1 kg of rock sample having 1.97% gold (w/w). [Molecular weight of Au = 197, K = 39, C = 12, N = 14, O = 16]

Prashant Kotian · Accepted Answer

Correct answer: B. Br H H (x) Br H H (y) H H Br (z) Molecule (x) show slowest E2 reactivity as Br is present at equatorial position.

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