The shape of $CH_3^+$ species is

In the acetylene molecule,the $C-H$ sigma bond is formed by the overlap of which orbitals?

Which of the following has $sp^3$ hybridization?

What type of overlap is involved in the formation of $C-H$ bonds in acetylene molecules?

Fill in the blanks:
$(i)$ Based on the type of overlapping,covalent bonds are classified into ........ and .......... .
$(ii)$ The bond formation involving hybrid orbitals is called ............. .
$(iii)$ The type of hybridization observed in the $C_2H_6$ molecule is ........... .
$(iv)$ The type of hybridization observed in the $BrF_5$ complex is ............... .

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 $Y$?