Question
Which of the following is a meso compound ?

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($A$) $\mathrm{LiAlH}_4$ in $\left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{O}$
($B$) $\mathrm{BH}_3$ in $THF$
($C$) $\mathrm{NaBH}_4$ in $\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}$
($D$) Raney $\mathrm{Ni} / \mathrm{H}_2$ in $\mathrm{THF}$
| Item $I$ | Item $II$ |
| $A$ Allosteric effect | $P$ Molecule binding to the active site of enzyme |
| $B$ Competitive inhibitor | $Q$ Molecule crucial for communication in the body |
| $C$ Receptor | $R$ Molecule binding to a site other than the active site of enzyme |
| $D$ Poison | $S$ Molecule binding to the enzyme covalently |
$\Delta E = - 2.0 \times {10^{ - 18}}\,J\left( {\frac{1}{{n_2^2}} - \frac{1}{{n_1^2}}} \right)$
the wavelength of the light that must be absorbed to excite hydrogen electron from level $n\, = 1$ to level $n\, = 2$ will be: $(h\, = 6.625\times10^{-34}\, J\,s,\, C\, = 3\times10^8\, m\,s^{-1})$