(CH3)2SiCl2 undergoes hydrolysis but (CH3)2CCl2 does not. This is because

Due to the presence of empty d-orbitals in the valence shell of 'Si'(CH3)2SiCl2 can accept the electron pair from water and undergoes hydrolysisExcited state configuration of 'Si'  is  [Ne] 3S1 3P3 3d0Where as in case of  (CH3)2CCl2 , the central atom carbon donot have empty d-orbitals in its valence shelland it is unable to accept the electron pair from water   Hence it can not undergo hydrolysis