MCQ
Which one of the following should be most stable
- A$H_2^ + $
- B${H^ + }$
- C$H$
- ✓${H^ - }$
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What is the standard free energy change for the reaction ${H_2}(g) + 2\,C\,(s) \to {C_2}{H_2}(g)$ .....$kJ$

$HC \equiv CH\mathop {\xrightarrow{{NaN{H_2},C{H_3}COC{H_3}}}}\limits_{{H^ + }} X\mathop {\xrightarrow{{H{g^{2 + }},{H_3}{O^ + }}}}\limits_{{H_2}O} Z$ is
The $\%$ yield for reaction $I$ is $60 \%$ and that of reaction II is $50 \%$. The overall yield of the complete reaction is $..........\%$ [nearest integer]