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Ortho nitrotoluene is more reactive than paranitrotoluene towards Electrophilic Substitution reaction(therefore being less stable) the reason being that though both Ortho and paradirecting groups are activating groups(i.e they increase reactivity of the compound towards the above reaction) para position is less ...
In Reiner tiemann rnx, we use phenol and base. Since we know the phenolic hydrogen is acidic, so the base will abstract that proton. As a result, phenoxide ion is formed. Now the O- will show +M and +I effect. So the product should be formed on ortho and para position. But, we also know that I effect dies with distance, so the ortho position will be more electron rich as compare to para position, and the incoming electrophile (carbene) will attack on ortho carbon.
Hence we get ortho as the only product in this case.