Odor is a chemical property because it is related to chemical composition. When a material is mixed with other materials and/or heated, and a new odor is detected, that means a new substance has been formed. Any change that produces one or more new substances is a chemical change.
Even if no changes take place, odor is related to the chemical composition of a specific substance. For example, isopentyl acetate has the odor of bananas. Inversely, if you smell bananas, isopentyl acetate is present.
Is odor a physical property? I would think it would be, but then again odor is caused by chemicals.
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