MCQ
Which one of the following is paramagnetic
- A$Zn^{2+}$
- ✓$Ni^{2+}$
- C$Cu^{+}$
- Dnone of the above
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$(I)$ $1\, M$ glucose $(aq.)$
$(II)$ $1\, M$ sodium chloride $(aq.)$
$(III)$ $1\, M$ acetic acid in benzene
$(IV)$ $1\, M$ ammonium phosphate $(aq.)$

Pair $-\,A:$ $(1) \,2 - $ Chloropropane $(2) \,2-$ Bromopropane
Pair $-\,B:$ $(3) \,1 -$ Bromobutane $(4)\, 2-$ Bromobutane