MCQ
In the given reaction $[X]$ will be :


- A

- B

- ✓Mixture of $(A)$ and $(B)$
- D





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| Element | Fe | Co | Ni | Cu |
| Metallic radii/pm | 126 | 125 | 125 | 128 |
$2PhCHO \xrightarrow{{:\mathop O\limits^ \ominus H}}PhC{H_2}OH + PhC\mathop {O_2^ \ominus }\limits^{.\,\,.\,\,} $
the slowest step is :

Assertion $(A)$ : Haloalkanes react with $\mathrm{KCN}$ to form alkyl cyanides as a main product while with $\mathrm{AgCN}$ form isocyanide as the main product.
Reason $(R)$ : $\mathrm{KCN}$ and $\mathrm{AgCN}$ both are highly ionic compounds.
In the light of the above statement, choose the most appropriate answer from the options given below: