MCQ
$Y$ is


- A

- B

- ✓

- D







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${\left[\mathrm{V}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}, \quad\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}, \quad\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+},}$
${\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+},\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}}$
[Given atomic numbers: $\mathrm{V}=23, \mathrm{Cr}=24, \mathrm{Fe}=26$,
$\mathrm{Ni}=28, \mathrm{Cu}=29]$

$CH_3CHO$ $\xrightarrow[{\left( {ii} \right)\,{H_2}O}]{{(i)\,C{H_3}MgBr}}A\xrightarrow[\Delta ]{{{H_2}S{O_4}}}B\xrightarrow[{Oxidation}]{{Hydroboaration}}C$