- A

- B

- ✓$\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,\,} \\
{||\,\,\,\,\,\,\,\,\,} \\
{C{H_3} - C - C{H_2} - Cl}
\end{array}$ and $CH_3-CH_2-Cl$ - D




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$\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}, \quad\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-} \text {, }$
$(A)$ $(B)$
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+}, \quad\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}$
$(C)$ $(D)$
The correct order of $A$, $B$, $C$ and $D$ in terms of wavenumber of light absorbed is :
$Me_2CHCH_2NHCH_2CH_2Me $ $\xrightarrow[\begin{smallmatrix}
(ii)\,A{{g}_{2}}O \\
(iii)\,\Delta
\end{smallmatrix}]{(i)\,C{{H}_{3}}-I(excess)}$ Product

$3$-ethyny$l-2$-hydroxy-$4$-methylhex-$3$-en-$5$-ynoic acid?