MCQ
From the ground state electronic configuration of the elements given below, pick up the one with highest value of second ionization energy
- A$1s^2\, 2s^2 \,2p^6 \,3s^2$
- ✓$1s^2\,2s^2\, 2p^6 \,3s^1$
- C$1s^2 \,2s^2 \,2p^6$
- D$1s^2\, 2s^2 \,2p^5$
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| Acid | $K_a$ |
| $HCN$ | $6.2\times 10^{-10}$ |
| $HF$ | $7.2\times 10^{-4}$ |
| $HNO_2$ | $4.0\times 10^{-4}$ |
Correct order of increasing base strength of the base $CN^-,F^-$ and $NO_2^-$ will be
$C{H_3}C{H_2}C{H_2}OH \xrightarrow{PCl_3}A\xrightarrow{Alco.KOH}B$
$PhCHO + Ph \cdot CHO \xrightarrow[in\,\,{{D}_{2}}O]{NaOD} A + \begin{matrix} O \\ || \\ Ph-C-{{O}^{-}} \\ \end{matrix}$$\left( Ph\right.$ is $\left.- C _{6} H _{5}\right)$