Chemical bond implies

Statement $(A)$ $CO_2$ has no dipole moment,whereas $SO_2$ and $H_2O$ have dipole moment.
Statement $(B)$ $SnCl_2$ is ionic,whereas $SnCl_4$ is covalent.
Which of the following is correct?

Which of the following has been arranged in order of decreasing bond length?

How many $S-S$ bonds,$S-O-S$ bonds,$\sigma$-bonds,and $\pi$-bonds are present in the trimer of sulphur trioxide $(S_3O_9)$?

Which of the following species exists?

Which of the following is an incorrect statement?