Expression tree can be your option here

yes

Yes

It is not Possible Because of first compiler check and gives an error

Dynamic LINQ Queries with Expression Trees can be used

Dynamic LINQ library can be used to achieve this.

By default its not possible in LINQ, You need you to write your own logic of few hundred lines to achieve this. By doing so it would be possible to possible to pick a column at runtime, also possible to decide filter at runtime. Expression Tree classes can help you achieve this.