MCQ
Reagent $A$ may be


- A$H_2O/H^+$
- B$BH_3 . THF/H_2O_2 -OH^-$
- ✓$Hg(OCOCH_3)_2.H_2O/NaBH_4 .NaOH$
- DAll are possible

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$2CrO_4^{2 - } + 2{H^ + } \to C{r_2}O_7^{2 - } + {H_2}O$


${C_6}{H_6}(l)\, + \,\frac{{15}}{2}\,{O_2}(g)\, \to \,6\,C{O_2}(g)\, + \,3{H_2}O\,(g)$
Signs of $\Delta H,\,\Delta S$ and $\Delta G$ for the above reaction will be