Part 1 Which chemical reaction model is flawed?
O A. 2 H20 - 2 H2 + O2
OB. Cl + H20 - HOCI + HCI
OC. CH4 + 2 02 - CO2 + 2 H20
OD. 2 CH3CH2OH + 6 02 - 4 CO2 + 6 H20

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".