Impulse invariance method is not preferred in the design of IIR filter other than low pass filter because of

Impulse invariance method: This method helps to design a digital filter whose impulse response is a sampled version of the analog filter's CONTINUOUS impulse response.In the method, we MAP each pole on the s-plane of the analog filter's transfer function to a pole on the z-plane for the discrete IIR's filter transfer function. The impulse invariance method can give useful IIR filters only when the sampling frequency is high as compared to the bandwidth of the signal that is to be filtered. IIR filters that are designed using the impulse invariance method can suffer from aliasing problems because PRACTICAL analog filters cannot be perfectly band-limited. Aliasing in the impulse invariance design methoda) Analog filter magnitude responseb) The REPLICATED magnitude responses where HIIR(ω) is the discrete FOURIER transform of h(n) = hc(nts)c) Potential resultant IIR filter magnitude response with aliasing effects.