MCQ
Radius of $1^{\text {st }}$ orbit of $H$ and some orbit of $Be ^{3+}$ is same . Energy of their orbit of $Be ^{3+}$ is ............$eV$
- ✓$-54.4$
- B$-13.6$
- C$-108.8$
- D$-27.2$
$r_{n} \propto \frac{n^{2}}{Z}$
$\left( r _{1}\right)_{ H }=\left( r _{ n }\right)_{ Be ^{3-}}$
$\frac{1^{2}}{1}=\frac{ n ^{2}}{4}$
$n =2$
The energy of their orbit is,
$( E )_{B e^{3+}}=-13.6\left(\frac{ Z ^{2}}{ n ^{2}}\right)$
$=-13.6\left(\frac{4^{2}}{2^{2}}\right)$
$=-54.4 \,e.V$
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$A \xrightarrow[ { Cu\; tube }]{\text { Redhot }}\mathrm{B} \xrightarrow[ Anhydrous AlCl_3]{\mathrm{CH}_{3} \mathrm{Cl}(1 \mathrm{eq}} \mathrm{C}$
($A$ is a lowest molecular weight alkyne)