Which one of the following is a planar molecule?

On what factor does the direction of a bond around the central atom depend?

Describe hybridization in the case of $PCl_5$ and $SF_6$. The axial bonds are longer as compared to equatorial bonds in $PCl_5$ whereas in $SF_6$ both axial bonds and equatorial bonds have the same bond length. Explain.

The hybridization of $P$ exhibited in $PF_{5}$ is $sp^{x}d^{y}$. The value of $y$ is $...$

If the dipole moment of an $MX_3$ molecule is zero,which orbital is used by the $M$ atom to form sigma bonds? (Atomic number of $M < 21$)

Provide the orbital structure of ethene showing: $(i)$ $\sigma$-bond $(ii)$ $\pi$-bond $(iii)$ The number of $\sigma$ and $\pi$-bonds $(iv)$ The hybridization.