MCQ
$\pi-$ bonding is not present in
- ✓Grignard reagent
- BDibenzene chromium
- CZeise’s salt
- DFerrocene
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$\left[\right.$ Given $\left.: \log _{10} 2=0.301, \ln 10=2.303\right]$
$Cr _{2} O _{7}^{2-}+14 H ^{+}+6 e ^{-} \rightarrow 2 Cr ^{3+}+7 H _{2} O$
The amount of $Cr ^{3+}$ obtained was $0.104\, g$. The
efficiency of the process(in\%) is
(Take : $F =96000\, C$, At. mass of chromium $=52$ )
$B$ and $C$ both gives $+ve$ iodoform test: $R$ and $R'$ can be :