Which among the following statements is correct?

$\mathrm{I}):{\mathrm{CF}}_2\text{ is more stable than : }{\mathrm{CCl}}_2$

II) ${\mathrm{CCl}}_2\text{ is more stable than : }{\mathrm{CBr}}_2$

III) $\text{ singlet : }{\mathrm{CH}}_2\text{ is more stable than triplet : }{\mathrm{CH}}_2$

IV) singlet carbene has planar geometry

• A

  I, II, IV

• B

  II, IV

• C

  I, II, III

• D

  II, III, IV