${\mathrm{S}}_1: \mathrm{The} \mathrm{HOMO} \mathrm{in} {\mathrm{F}}_2^{-} \mathrm{is} \mathrm{\pi }*2{\mathrm{p}}_{\mathrm{x}}=\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{y}}$ molecular orbitals.

$S_2: Bond order of O_2^{-} is more than O_2^{+}.$

$S_3: N{O}^{+} is more stable than N_2^{+}$

$S_4: C_2 is more stable than C_2^{+}$

State, in order, whether $S_1, S_2, S_3, S_4$ are true or false.