[sparkle2009]

Energy suitable to carry out the reaction coincides with th energy of
(a) Paschen series
(b)Lyman series
(c)Brackett series
(d)Pfund series

[pizza1512]

Is this suppose to be a question? 

[Arkcon]

Is this suppose to be a question? 

Normall, when a question like this, just definitions, is asked, I like to send the poster to their textbook, or other dictionary.  But, when I googled for each possible answer, I learned they are all definitions for hydrogen transitions, and there's more at work here than just hydrogen.  Just a confusing question, for me, at least.

[pizza1512]

Is this suppose to be a question? 

Normall, when a question like this, just definitions, is asked, I like to send the poster to their textbook, or other dictionary.  But, when I googled for each possible answer, I learned they are all definitions for hydrogen transitions, and there's more at work here than just hydrogen.  Just a confusing question, for me, at least.

Just wondering, what  'key words' did you search for to find these answers?

[macman104]

Just wondering, what  'key words' did you search for to find these answers?

I think what Arkcon means is that he googled each of the answers given (Paschen, Lyman, Brackett and Pfund), if you do, and you go to the wiki article, they all redirect to:

http://en.wikipedia.org/wiki/Hydrogen_spectral_series

[ARGOS++]

Dear Arkcon,   Dear macman104;

Is it correct if I re-interpret the question as following?:
   Find the Series of emitting Light which allows to start and continue the given reaction?

As I believe that the reaction is of  “radical” nature:  Cl₂  +  hv  --->   Cl^° +  Cl^°;   etc.,
In this case there is only one of the given Series, which is able to build the radicals.

I hope this is of help to find the “correct/adequate” Series.
Good Luck!
                    ARGOS⁺⁺