Hi,

to best predict the structure of a compound from the GC-MS (70 eV Electron Impact source I suppose), you need to compare your spectra with a reference library, like NIST.

https://www.nist.gov/srd/nist-standard-reference-database-1a-v17

It is not free, it requires a license.

Generally instrumental vendor softwares are already prepared to automatically use the NIST library to compare your spectra and assign putative identifications.

Identification can be confirmed using the Retention Index of your compounds of interest. The retention index is often reported in the NIST libraries. To calculate your retention index, follow the attached guide.

It is also possible to interpret your spectra manually, but this might be very time consuming and error-prone, especially for beginners.

http://chem-net.blogspot.com/2013/08/interpretimg-mass-spectra-gc-ms.html

this is just a basic guide... you can find better guides through the internet.

Good luck!!!

Luca

Thanks so much for your response...

It's really good information for me...

I will start do to work as per your kind suggestions