Question

An alcoholic solution of dimethylglyoxime is added to an aqueous solution of nickel(II) chloride. Slow addition of ammonium hydroxide led to the precipitation of a bright-red coloured metal complex. The number of hydrogen bonds present in the structure of the complex are:

• A. 6
• B. 0.0
• C. 2
• D. 4

Answer 1

The correct option is C 2

Structure of DMG is:

The complexation occurs as: $N{i}^{2+}+2dmg\stackrel{N{H}_{4}OH}{\to }\underset{\left(\text{bright red}\right)}{\left[Ni\right(dmg{)}_2]}\downarrow$

There are two H-bonds in the structure.