MCQ
Which pair of metals have almost the same size?
- ✓$Cd , Hg$
- B$Cu , Zn$
- C$Sc , Ti ^{\prime}$
- D$Cr . Mo$
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$R - \mathop {\mathop C\limits^{||} }\limits^O - OH\xleftarrow{{{H_3}{O^ + }}}X\xrightarrow{{[H]}}RC{H_2}N{H_2};$
'$X$' is
$PhCHO + Ph \cdot CHO \xrightarrow[in\,\,{{D}_{2}}O]{NaOD} A + \begin{matrix} O \\ || \\ Ph-C-{{O}^{-}} \\ \end{matrix}$$\left( Ph\right.$ is $\left.- C _{6} H _{5}\right)$
Reason : Cerium salts are used as catalyst in petroleum cracking.