MCQ
$CH \equiv CH\mathop {\xrightarrow{{Ni{{(CN)}_2}}}X}\limits_{{\text{Pressure}}} $ Here $X$ in the reaction
- ABenzene
- BEthane
- ✓Cycloctatetraene
- DCyclohexane

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$A\,\xrightarrow{{H{g^{2 + }}\,/\,{H^ + }}}B\,\xrightarrow{{NaB{H_4}}}C\,\xrightarrow[{conc.\,\,HCl}]{{ZnC{l_2}}}$ Turbidity within $5$ minutes.
Consider the following reactions $‘A’$ is

suitable reagent for the above conversion is
$[Figure]$ $\xrightarrow[{(ii)\,{H_2}S{O_4}\,,\,heat}]{{(i)\,OHCC{H_2}COCl}}$
Product $(C)$ of the above reaction is