$N{a_2}[{B_4}{O_5}{(OH)_4}].8{H_2}O + 2HCl \to 2NaCl + 4{H_3}B{O_3} + 5{H_2}O$
Methyl orange $(\mathrm{pH}=3.7)$ is used to detectend point. Aq solution of borax acts as buffer, as borax is salt of strong base $\mathrm{NaOH}$ and weak acid $\mathrm{H}_{3} \mathrm{BO}_{3}$.
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$\mathrm{C}\mathrm{H}_{3} -\mathrm{C} \equiv \mathrm{CH} \xrightarrow[873\;K]{\text { red hot iron tube}} \mathrm{A}$
the number of sigma$(\sigma)$ bonds present in the product $A$ is
$NH_2-CH_2-CH_2-NH_2 +$ $\begin{array}{*{20}{c}}
{COO{C_2}{H_5}} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{COO{C_2}{H_5}}
\end{array}$ $\xrightarrow{{Pyridne}}$ $[X]$
$[X]$ will be :
