What should be done if one recited birchas hamazon after a food that requires the borei nefashos? He has not fulfilled his obligation and must recite borei nefashos.
What should be done if one recited birchas hamazon after foods that require the al hamichya? He has fulfilled his obligation and need not recite al hamichya.
What should be done if one recited birchas hamazon over the species that require the al hapeiros? He has not fulfilled his obligation and must recite al hapeiros.
What should be done if one recited al hamichya over foods that require the borei nefashos? He has not fulfilled his obligation and must recite borei nefashos.
What should be done if one who is benching realizes that he hadn't eaten bread? If he has not yet concluded the bracha hazan es hakol, he must transition into al hamichya. If he has concluded that bracha, he must stop and not continue.