In which of the following sets of molecules is the hybridisation of the central atoms different?

Compare the carbon-carbon $\sigma$ bond length in ethane, ethylene and acetylene.

Among the compounds,$BF_3$,$NCl_3$,$H_2S$,$SF_4$ and $BeCl_2$,identify the ones in which the central atom has the same type of hybridization.

Which statement is correct about $CO_2$ if the central atom uses $s + P_x$ orbitals in hybridization?
$(i)$ $\pi$ bond will be formed by $P_y$ and $P_z$
$(ii)$ molecule can be in $XY$ plane
$(iii)$ molecule can be in $XZ$ plane
$(iv)$ molecule can be in infinite plane
$(v)$ molecule can be in $YZ$ plane
Correct code is:

The structures of $BCl_3$ and $BCl_3 \cdot NH_3$,respectively are

$sp^3$ hybridization leads to which shape of the molecule?