Fill the blanks with the proof of choices given:
(a) The four pyrrole rings in the porphyrin head are linked by
(b) Carotenoids have.......
(c) Chlorophy II-b has.........
(d) Chlorophy II-a has..
(1) Canjugate double bonds. (2) Formyl (-1CHO) group,
(3)-CH3 group, (4) Methene bridges (-CH=)