Which of the following compounds will undergo decarboxylation on heating?

Which of the following tetracarboxylic acids forms a di-anhydride upon heating?

Write the chemical reactions of acetic acid $(CH_3COOH)$ with the following reagents:
$(i)$ Excess $Cl_2$ $+$ Red $P$ followed by $H_2O$
$(ii)$ Heating with sodalime $(NaOH + CaO)$
$(iii)$ Electrolysis of its sodium salt ($Kolbe's$ electrolysis)
$(iv)$ Heating with excess ammonia $(NH_3)$
$(v)$ Reaction with $PCl_5$
$(vi)$ Reaction with $PCl_3$
$(vii)$ Reaction with $SOCl_2$
$(viii)$ Heating with $P_2O_5$
$(ix)$ Reaction with $NaOH_{(aq)}$
$(x)$ Reaction with $NaHCO_{3_{(aq)}}$
$(xi)$ Reaction with $Na$ metal
$(xii)$ Reaction with $LiAlH_4$ / ether or $BH_3$
$(xiii)$ Reaction with ethanol $(C_2H_5OH)$ in the presence of $H_2SO_4$ or $HCl$ gas

$C_6H_6$ $\xrightarrow[AlCl_3]{(CH_3)_2CHCOCl}$ $\xrightarrow[\text{reduction}]{\text{Clemmensen}}$ $\xrightarrow[AlCl_3]{CH_3COCl}$ $\xrightarrow[\text{Red } P + HI]{H_3O^{\oplus}} (\text{Ibuprofen})$
Ibuprofen is

Find out the major products $A$ and $B$ from the following reaction sequence.

The product $(C)$ of the above reaction is: