MCQ
Which of the following elements is found in native state
- A$Al$
- ✓$Au$
- C$Cu$
- D$Na$
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| Reaction | Product | |
| $I$ | $RX + AgCN$ | $RNC$ |
| $II$ | $RX + KCN$ | $RCN$ |
| $III$ | $RX + KNO_2$ | (image) |
| $IV$ | $RX + AgNO_2$ | $R-O-N = O$ |

$(A)$ All are isoelectronic
$(B)$ All have the same nuclear charge
$(C)$ $\mathrm{O}^{2-}$ has the largest ionic radii
$(D)$ $\mathrm{Mg}^{2+}$ has the smallest ionic radii
Choose the most appropriate answer from the options given below :
| Column $I$ | Column $II$ |
| $(A)$ $\mathrm{C}_6 \mathrm{H}_5 \mathrm{CHO}$ | $(p)$ gives precipitate with $2, 4$-dinitrophenylhydrazine |
| $(B)$ $\mathrm{CH}_3 \mathrm{C} \equiv \mathrm{CH}$ | $(q)$ gives precipitate with $\mathrm{AgNO}_3$ |
| $(C)$ $\mathrm{CN}^{-}$ | $(r)$ is a nucleophile |
| $(D)$ $\mathrm{I}^{-}$ | $(s)$ is involved in cyanohydrin formation |
