I want to ask you guys there is any benefit of google knol it can help to get good SERP position in search engine or can help in any mean?

Google has announced the death of Google knol on 22 november 2011. Knol will work as usual until April 30, 2012, and you can download your knols to a file and/or migrate them to WordPress.com. From May 1 through October 1, 2012, knols will no longer be viewable, but can be downloaded and exported. After that time, Knol content will no longer be accessible.
Hence it will not impact rankings in any way..