Which of the following halides does not exist?

‘Lapis-Lazuli’ is a blue-coloured precious stone. It is a mineral of the class:

In which of the following arrangements,the sequence is not strictly according to the property written against it?

Which of the following reaction products are represented correctly?
$(a)\ P_4 + 3NaOH(dil) + 3H_2O \to PH_3 + 3NaH_2PO_2$
$(b)\ 3Br_2 + 6NaOH(conc) \to 5NaBr + NaBrO_3 + 3H_2O$
$(c)\ NCl_3 + 3H_2O \to NH_3 + 3HOCl$
$(d)\ I_2 + 2NaOH \to NaI + NaOI + H_2O$
$(e)\ Al_4C_3 + 12H_2O \to 4Al(OH)_3 + 3CH_4$
$(f)\ N_2O_4 + H_2O \to HNO_3 + HNO_2$
$(g)\ NH_4NO_3 + NaOH \to NH_3 + NaNO_3 + H_2O$
Correct options are:

White phosphorus $(P_4)$ has

Which of the following is a mixed anhydride?