NOMENCLATURE OF BENZENE COMPOUNDS

Question 1

TRIVIAL NAMES OF POSITIONS OF 1,2; 1,3; 1,4

AND WHEN CAN THESE PREFIXES BE USED

Answer 1

ortho(o)
meta(m)
para(p)
THESE CAN WHEN THERE ARE ONLY 2 SUBSTITUENTS IN THE BENZENE RING

Question 2

WHEN IS PHENYL USED

Answer 2

IT IS USED WHEN BENZENE RING IS ATTACHED TO ALKANE WITH A FUNCTIONAL GROUP, IT IS CONSIDERED AS SUBSTITUENT INSTEAD OF PARENT.
IT IS C6H5 AND ABBREVIATED AS Ph