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Alkanes are unreactive towards NaOH, H2SO4, and K2Cr2O7 because they are saturated hydrocarbons. They have no functional groups or reactive sites that can be attacked by these reagents.
NaOH is a strong base that can react with acids and certain organic functional groups. H2SO4 is a strong acid that can react with bases, metals, and certain organic functional groups. K2Cr2O7 is a strong oxidizing agent that can react with reducing agents and certain organic functional groups.
Alkanes do not contain any of these functional groups, so they do not react with these reagents.