All credit to Deepak sir
L1 is undecidable, by rice theorem part 2, it is undecidable as it is non monotonic property
L2 is decidable as check for 100 steps, it is accept accepts, else reject
L3 is undecidable as It is non trivial property , by rice theorem, it is undecidable
L4 is undecidable as it is also non trivial, hence by rice theorem it is undecidable.