MCQ
Here, $A$ and $B$ respectively are :-


- Apropene and methanal
- Bpropane and ethanal
- Cpropene and ethanol
- ✓propene and ethanal

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| Complexes | No. of unpaired electron | ||
| $A$ | $[CrF_6]^{-4}$ | $P$ | $5$ |
| $B$ | $[MnF_6]^{-4}$ | $Q$ | $2$ |
| $C$ | $[Cr(CN)_6]^{-4}$ | $R$ | $1$ |
| $D$ | $[Mn(CN)_6]^{-4}$ | $S$ | $4$ |
$\mathrm{R}=8.314\; \mathrm{JK}^{-1} \mathrm{mol}^{-1}$
(Density of water $= 1\,gm/ml$ )