I know that Op-Amps (say 741) cannot be used for high frequencies to work either as a comparator or as amplifier.
Is there any way to find the information regarding the maximum frequency of operation for a particular Op-Amp? (since it is not specified in the datasheet).
Actually, the maximum operating frequency for an op amp is given in the datasheet, but it has a different name. Look for gain bandwidth product or GBP on your datasheet. Sometimes there will be a graph showing open loop gain versus frequency.
Since there is a rise time or slew rate for signals in an op amp, there is an inverse relationship between gain and operating frequency. The wikipedia article has a reasonable illustration: Gain-bandwidth product - Wikipedia, the free encyclopedia.