The correct order of increasing bond length of $C - H, C - O, C - C$ and $C=C$ is

The oxidation state $(n)$, coordination number $(CN)$ of $Al$, and the number of valence electrons around $Al$ $(N)$ in $Al_2Cl_6$ are respectively:

Determine the correct $(T)$ and incorrect $(F)$ statements for the permanganate ion $(MnO_4^-)$:
$(a)$ $MnO_4^-$ contains $\sigma$ bonds.
$(b)$ $MnO_4^-$ contains $\pi$ bonds.
$(c)$ $MnO_4^-$ contains both $\sigma$ and $\pi$ bonds.
$(d)$ $MnO_4^-$ is paramagnetic.

In which of the following pairs is the product of the Lewis acid and Lewis base reaction also a Lewis base?

The correct statements from the following are:
$a$) The total number of sigma bonds present in benzene is $12$
$b$) $LiF$ is more covalent than $KF$
$c$) $SnCl_2$ is more covalent than $SnCl_4$

What is chemical bonding? How is it formed,and what are its types?