1.Differentiate the rules in case of loss of a generic thing versus loss of a specific thing.

2.Having failed to pay rent for three (4) months, the landlord demanded that the tenant pay the back rentals and vacate the premises. Afterwards, the landlord filed a complaint for unlawful detainer. The tenant contends that the landlord refused to accept the rents. Is the contention of the tenant a valid defense to release him from his responsibility to pay rent? What should have been the action by the tenant to release him from responsibility?