ChemInform Abstract: KINETIC STUDY OF THE PHOTOCHLORINATION OF 2,3‐DIMETHYLBUTANE AND OTHER ALKANES IN SOLUTION IN THE PRESENCE OF BENZENE. FIRST MEASUREMENTS OF THE ABSOLUTE RATE CONSTANTS FOR HYDROGEN ABSTRACTION BY THE “FREE” CHLORINE ATOM AND THE CHLORINE ATOM‐BENZENE Π‐COMPLEX. IDENTIFICATION OF THESE TWO SPECIES AS THE ONLY HYDROGEN ABSTRACTORS IN THESE SYSTEMS