The correct option is A C
Except C all other elements of group 14 react directly with halogen under suitable conditions to form halides of formula MX2 and MX4.
Hence, the correct answer is option (a).
⇒Reactivity towards oxygen:
All members when heated in oxygen form oxides
The acidity of oxides in higher oxidation states is greater than the acidity of oxides
in lower oxidation states.
CO2,SiO2 and GeO2 are acidic in nature. SnO2 and PbO2 are amphoteric in nature. GeO is acidic, CO is neutral. SnO and PbO are amphoteric in nature.
⇒Reactivity towards water:
Carbon, silicon, and germanium are not affected by water.
Tin decomposes steam to form dioxide and dihydrogen gas.
Lead is unaffected by water, due to the protective oxide film formation.
⇒Reactivity towards halogen:
These elements can form halides of formula MX2 and MX4 where X = F, Cl, Br, I
Except for C, all other elements react directly with halogen under suitable conditions to form halides.
Except SnF4 & PbF4 most of the MX4 are covalent in nature.
The central atom in the halides is sp3 hybridized and the molecule is tetrahedral in shape.
PbI4 doesn’t exist.