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Question

Chemistry Question on Organic Chemistry- Some Basic Principles and Techniques

CuSO4CuSO_4decolourises on addition of KCN, the product is

A

[Cu(CN)4]2−[Cu(CN)_4]^{2-}

B

Cu2+Cu^{2+} get reduced to form [Cu(CN)4]3−[Cu(CN)_4]^{3-}

C

Cu(CN)2Cu(CN)_2

D

CuCN

Answer

Cu2+Cu^{2+} get reduced to form [Cu(CN)4]3−[Cu(CN)_4]^{3-}

Explanation

Solution

CuSo4+2KCN⟶Cu(CN)2+K2SO4CuSo_4 + 2KCN \longrightarrow Cu(CN)_2 + K_2 SO_4
2Cu(CN)2Unstable⟶2Cu(CN)+∣CNCN  (Cyanogen)\underset{Unstable}{2Cu(CN)_2} \longrightarrow2Cu(CN) + \bigg|_{CN}^{CN} \, \, (Cyanogen)
CuCN+3KCN⟶3K++[Cu(CN)4]3−CuCN + 3KCN \longrightarrow 3K^+ + [Cu(CN)_4]^{3-}