IR spectra will give u a rough idea about an unknown compound , CHECK ur IR spectra with standard one or the IR values with the values given in the IR table

First you need to index all the IR spectrum peaks from your sample. A standard library of various molecular vibrational frequencies (IR) is required , for example, carbon-oxygen molecules, carbon-carbon molecules, carbon-hydrogen, hydorgen-oxygen, and other organic bonds for search and match.

many textbooks are availble on this topic.

The question is too general to give a concise answer. However, for quick analysis you need to make fingerprint comparisons with data bases, and make allowance for other effects which cause shifts in bands.

For in depth analysis, you may need to use group theoretical techniques for complete assignment of all bands. Group theory gives you excellent understanding and analysis.

For in depth analysis, you may need to do measurement for gas phase spectra. Shapes of band and their peaks give excellent information about the system.

For more complete analysis, you may need to use Raman Scattering Spectra (which in many cases complement FTIR spectra).

Therefore, it depends on what you exactly need.

Dear Goswami

IR spectra will give u a rough idea about an unknown compound and types of molecular vibration .In spectra increase area under the curve and FWH increasing the concentration of peak of unknown molecular

Dear Dr Afridi ·

Thanks for reply

can you suggest how can I get standard spectra.

than you Moumita for very useful link.

Dear Dr Hikmat

Initially I need to study the presence of various groups in the product.

then definitely I wil be interested in all details of bands

Dear Dr Anwer,

what this in increase are under the curve indicates

Hello Yougesh

Initially you just need fingerprint and possible band shifting that result from different environments

Then, you need to consider a comprehensive analysis, and you may need to complement your study with Raman Scattering Spectra

You need a book like Russel Drago (his two books are really useful) or Ebsworth/Rankin/Cradock (Structural Methods in Inorganic Chemistry,....).

Please find attached book. This book might be helpful. 

Use this short way and compare your IR spectra peaks values with these given in the table.

http://www.instruction.greenriver.edu/kmarr/chem%20162/Chem162%20Labs/Interpreting%20IR%20Spectra/IR%20Absorptions%20for%20Functional%20Groups.htm

Thanks for information