I have access to certified organic seeds. I want to raise the organic seeds in a soilless, hydroponic solution. I'm just wondering if I raise the plants like this would I be deceitful to market the resulting product as 'organic'?
If you live in the USA, you could sell the produce as 'organic' in theory, provided the nutrients you supply to your plants are on the approved list as 'organic nutrients'. This area is not a clear one in the USA though, see here https://modernfarmer.com/2017/05/is-hydro-organic-farming-organic/
However, in most other countries of the world, no, hydroponically grown foodstuffs are not considered organic, whatever nutrients are used; the term 'organic' applies only to crops growing in soil in a particular way. The particular requirements for organic certification may be specific to individual countries or trading blocs, but all will have a certification scheme of some sort and all will be grown in soil. Best to contact whatever body issues organic certification for your country to find out the exact requirements.