A teacher discusses the reactive species formed when a covalent bond breaks. Two statements about them are given below. Statement I: Alkyl free radicals become more stable from primary to secondary to tertiary, so the tert-butyl radical, $(\text{CH}_3)_3\text{C}^\bullet$, is more stable than the ethyl radical, and the methyl radical is the least stable alkyl radical. Statement II: In the carbanion $\text{CH}_3^-$, the carbon atom is $sp^2$ hybridised and the ion is planar, just like the methyl carbocation.