Unit-I  Fundamental  Principles  of 
  Photochemistry  Absorption  of  light 
  by  molecules:  direct  and  indirect 
  excitation,   electronically    excited 
  states, types of excitation, and laws 
  of  photochemistry.  Properties  of 
  excited      states:      decay       of 
  electronically  excited  states,  spin 
  allowed      and     spin    forbidden 
  transitions. 
   Photophysical     processes:     radiative 
   (fluorescence,  phosphorescence),  non- 
   radiative     (state-to-state   crossing, 
   vibrational  relaxation),  combination  of 
   radiative  and  non-radiative  processes, 
   Jablonski diagram. Transfer of excitation 
   energy- photosensitization and quenching. 
   Excited-state complex formation: excimer 
   and  exciplex.  Photoinduced  electron 
   transfer:       homogeneous           and 
   heterogeneous    photoelectron   transfer 
   reactions.
 Unit-II A. Photochemistry of Alkenes 
 Intramolecular   reactions   of   the 
 olefinic     bond:       geometrical 
 isomerism,    cyclisation  reactions, 
 rearrangement  of  1,  4-and  1,  5-
 dienes. 
  B.  Photochemistry  of  Carbonyl 
  CompoundsIntramolecular 
  reactions of carbonyl compounds: 
  saturated, cyclic and acyclic, β, λ- 
  Unsaturated and α, β- unsaturated 
  compounds,                      and 
  Cyclohexadienone. Intramolecular 
  cycloaddition             reactions-
  dimerisations        and    oxetane 
  formation.
    Photochemistry