Hybridisation states of $C$ in $CH_3^+$ and $CH_4$ are

Sulphur reacts with chlorine in $1:2$ ratio and forms $X$. Hydrolysis of $X$ gives a sulphur compound $Y$. What is the structure and hybridisation of the anion of $Y$?

$KI + MnO_2 + H_2SO_4 \to$ Vapours $(B) +$ other products
Vapours $(B) + K_2S_2O_8 \to (C) + (D)$
$(D) \xrightarrow{(B)}$ Brown $(E)$
Hybridisation of central atom in $(E)$ is

$NH_2CONH_2 + 2 H_2O \rightarrow [X] \rightleftharpoons 2 NH_3 + H_2O + [Y]$
The hybridization of carbon in $X$ and $Y$ respectively are

The hybridisation of the central atom $I$ in $IF_7$ is:

Which of the following statements is correct in the context of the allene molecule,$C_3H_4$?