4. d and f- block elements — Chemistry STD 12 Science — Question

$W + {O_2}\, \rightleftharpoons X$

$X + {H_2O}\, \rightleftharpoons Y + W$

correct statement is

$\begin{array}{*{20}{c}}
  {C{H_2} - COOH} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_2} - COOH} 
\end{array}\xrightarrow{\Delta }(A)\xrightarrow{{C{H_3} - C{H_2}N{H_2}/\Delta }}(B)$

$(B)$ will be :

$(a)$ Number of $S-S$ bonds in $H_2S_nO_6$ are $(n +1)$

$(b)$ When $F_2$ reacts with $H_2O$ it forms $HF,$ $O_2$ & $O_3.$

$(c)$ $XeF_6$ on hydrolysis shows disproportionation reaction

$(d)$ $Al$ metal on reacting with dilute $NaOH$ gives a white precipitate of $Al (OH)_3$ as a final product