General Principles and Processes of Isolation of Elements — Chemistry STD 12 Science — Question

The correct statement($s$) regarding $P , Q , R$ and $S$ is(are)

$(A)$ Reaction of $P$ with $R$ in the presence of $KOH$ followed by acidification gives

$(B)$ Reaction of $R$ with $O _2$ in the presence of light gives phosgene gas

$(C)$ $Q$ reacts with aqueous $NaOH$ to produce $Cl _3 CCH _2 OH$ and $Cl _3 CCOONa$

$(D)$ $S$ on heating gives $P$

$Zn_{(s)} + Ag_2O_{(s)} + H_2O_{(l)} \rightleftharpoons  $$2Ag_{(s)} + Zn^{2+}_{(aq)}+ 2OH^-_{(aq)}$

If half cell potentials are

$Zn^{2+}_{(aq)} + 2e^- \rightarrow Zn_{(s)}\,;\,\, E^o = - 0.76\, V$

$Ag_2O_{(s)} + H_2O_{(l)} + 2e^- \rightarrow 2Ag_{(s)} + 2OH^-_{(aq)}\,,$$E^o = 0.34\, V$

The cell potential will be ........... $V.$

What is structure of $(A)$ ?

The original compound showed these properties also :

$\mathop {{C_9}{H_{12}}{O_2}}\limits_{(A)} \,\xrightarrow{{Na}}\,{H_2}$  liberated

$\mathop {{C_9}{H_{12}}{O_2}}\limits_{(A)} \,\xrightarrow{{Br}}$  no rapid reaction

$\mathop {{C_9}{H_{12}}{O_2}}\limits_{(A)} \,\xrightarrow[{cool}]{{Cr{O_3}\,/\,{H^ + }}}{C_9}{H_8}{O_3}$