MCQ
Product $(A)$ of the reaction is


- A

- ✓no reaction
- C

- D





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$R - X\xrightarrow{{KCN}}A\mathop {\xrightarrow{{NaOH}}}\limits_{{H_2}O} $ $B$ is

$C + {O_2} \to C{O_2};\,\Delta H = - 394\,kJ\,mo{l^{ - 1}}$
$2CO + {O_2} \to 2C{O_2};\,\Delta H = - 569\,kJ\,mo{l^{ - 1}}$ The heat of formation of $1\,mol$ of carbon monoxide is thus .....$kJ\,mo{l^{ - 1}}$
(image) $\frac{{{H_2}}}{{pd - BaS{O_4}}}\,'A'$
The product $'A'$ is