how to delete the meta data from production org?

Hello Saloni,

As Bob suggested, you should first delete it from your sand box using force.com IDE.

Below are the steps:

1) From Force.com IDE, select the class that you want to delete (Look for .xml extension )

2) Open that .xml version of your class and change the Status tag to Deleted.

3) Right click and save the file.

4) Now select "SRC" folder and right click--->Select Force.com---> select Deploy to server

5) Log into your production org and follow the steps.

Note: if you have any test class for the class that you are deleting make sure you do the same like above and then select those 2 classes for final deployment.

Hope it helps.