MCQ
Among the given cations, the most stable carbonium ion is ?
- Asec-butyl
- ✓tert-butyl
- C$n$ -butyl
- DNone of these
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$ \mathrm{Sr}^{2+}(\mathrm{Z}=38), \mathrm{Cs}^{+}(\mathrm{Z}=55), \mathrm{La}^{2+}(\mathrm{Z}=57) \mathrm{Pb}^{2+} $
$ (\mathrm{Z}=82), \mathrm{Yb}^{2+}(\mathrm{Z}=70) \text { and } \mathrm{Fe}^{2+}(\mathrm{Z}=26)$


$(b)\, NaOH$ in $20\, gm$ will be respectively.