discuss about other separation technique other than gas chromatography.?

Answer 1

Like the other answerer said in your other identical question (by the way, quick note: sure way to annoy people on here is to repost the same question multiple times. It's actually a violation of the community guidelines), it depends on what you're trying to separate.

Gas chromatography is good for separating small volatile organic molecules. Liquid chromatography can separate any molecule, and based on hydrophobicity, hydrophilicity, chirality, etc. Electrophoresis techniques (applying an electric field) are good for separating highly charged things, such as DNA, RNA, and proteins, although all three can also be separated by liquid chromatography. That should give you a good start.

You can read about other common types here:
http://en.wikipedia.org/wiki/Chromatography