Diphenyl compound does not follow huckle rule for an organic compound to be aromatic, yet it is aromatic. how?

No, it doesn't. According to huckle rule it must have 14 \pi electrons to be aromatic but it has only 12 pi electrons. then how does it follow the rule?

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We can observe physical properties of elements and compounds without changing the substance.

Examples of physical properties: Density, color, boiling point, state of matter, appearance: dull or shiny, etc. 

But we can also observe and measure chemical properties by reacting a substance with something else. For example, like mixing baking soda and vinegar together. The vinegar reacts with the baking soda and produces carbon dioxide: a new substance. 

Some examples of chemical properties: Flammability, amount of heat that is released during combustion, toxicity (how much damage it causes to other organisms), radioactivity, and ability to oxidize (when you have metal that becomes rusty looking).