Which of the following is not true of carbon?

it can form rings

it has a valance of four

it forms strong ionic bonds

it can bond to form long chains

We have to know which of the given statement is not true of carbon.

Not true statement of carbon is - it forms strong ionic bonds.

It can not form ionic bond. to produce ionic bond, carbon has to be converted into either C⁴⁺ or C⁴⁻.

The electronic configuration of C-atom is 1s²2s²2p⁴.

To form C⁴⁺ cation, four electrons must be removed from outermost shell of carbon atom which requires huge energy to supply.

To form C⁴⁻ anion, four electrons must be added to outermost shell of carbon atom which is not possible as outermost shell of C-atom does not have 2d orbital to accommodate extra electrons.