The correct option is C A and D
CO2 is linear because of sp hybridization of carbon consisting of 2 bond pairs.
HgCl2 is linear.
NO2 has V (or) Bent shape due to sp2 hybridization, where nitrogen forms 2 bond pairs and 1 lone pair.
SnCl2 has bent structure due to the presence of lone pairs on tin.
C2H2 is linear because carbon is sp hybridized with 2 bond pairs.