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An Intiative by Sri Chaitanya
a
Dobereiner arranged element by the help of triads methods
b
Law of triads seemed to work for large number of elements
c
The properties of Br were in between those of CI and I
d
Both (a) and (c
answer is D.
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Detailed Solution
Dobereiner arranged element by the help of triads methods. Law of triads, seemed to work only for few, elements. The properties of Br were in between those of Cl and I.