MCQ
Which one of the following alkenes will react fastest with $H_2$ under catalytic hydro-genation condition
- ✓

- B

- C

- D






${}_H^H > C = C\, < \,_H^H$ ${}_R^R > C = C\, < \,_H^R$
${}_R^R > C = C\, < \,_H^H$ ${}_H^R > C = C\, < \,_H^R$
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| Complexes | No. of unpaired electron | ||
| $A$ | $[CrF_6]^{-4}$ | $P$ | $5$ |
| $B$ | $[MnF_6]^{-4}$ | $Q$ | $2$ |
| $C$ | $[Cr(CN)_6]^{-4}$ | $R$ | $1$ |
| $D$ | $[Mn(CN)_6]^{-4}$ | $S$ | $4$ |
