  We study the spherical top-hat collapse in Einstein gravity and loop quantum
cosmology by taking the non-linear evolution of viscous modified variable
chaplygin gas and viscous generalized cosmic chaplygin gas. We calculate the
equation of state parameter, square speed of sound, perturbed equation of state
parameter, perturbed square speed of sound, density contrast and divergence of
peculiar velocity in perturbed region and discussed their behavior. It is
observed that both chaplygin gas models support the spherical collapse in
Einstein as well as loop quantum cosmology because density contrast remains
positive in both cases and the perturbed equation of state parameter remains
positive at the present epoch as well as near future. It is remarked here that
these parameters provide the consistence results for both chaplygin gas models
in both gravities.
