MCQ
Glyoxal $(CHOCHO)$ on being heated with concentrated $NaOH$ forms.
- A$HOOC COOH$
- B$HOCH_2 -CH_2OH$
- C$CHOCOOH$
- ✓$CH_2OH -COONa$
$-\,CHO$ group oxidise in acidic group and another
$-\, CHO$ group of same comp. is reduced in alcohol.
$\begin{array}{*{20}{c}}
{C{H_2} - C - O - Na} \\
{\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{OH\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}\,$
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| LIST-I (Complex/Species) | LIST-II (Shape & magnetic moment) | ||
| A. | $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ | I. | Tetrahedral, 2.8 BM |
| B. | $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$ | II. | Square planar, 0 BM |
| C. | $\left[\mathrm{NiCl}_{4}\right]^{2-}$ | III. | Tetrahedral, 0 BM |
| D. | $\left[\mathrm{MnBr}_{4}\right]^{2-}$ | IV. | Tetrahedral, 5.9 BM |
$I :$ The three elements are metals.
$II :$ The electro negativities decrease from $X$ to $Y$ to $Z$.
$III :$ The atomic radius decreases in the order $X, Y$ and $Z.$
$IV : X, Y$ and $Z$ could be phosphorus, aluminium and sodium respectively.