Yes, those who have a schengen visa from valid country can apply for Turkey Visa online. For list of countries eligible and instruction can refer:
evisa.govt.tl/official/en-us/evisa.php
evisa.gov.tr/en/
Yes, You need a separate visa for Turkey. Turkey is not part of the Schengen Area. Schengen visas are not valid.
No,Turkey is not part of the Schengen Area. Schengen visas are not valid.Technically speaking, it is unclear whether or not the Schengen VISA holder can enter Turkey or not. It would depend on the passport the VISA holder has and whether or not that person can get additional VISAs. What is clear is that a Schengen VISA is not valid itself for entry to Turkey.
No, a Schengen visa is not valid for Istanbul. Istanbul is in Turkey, and Turkey is not part of the Schengen Area.
No, Turkey is not part of the Schengen Area. A Turkish visa is not valid for any other country.
Yes . There are no border controls between France and Monaco, so a Schengen visa is valid.
No. Cyprus is not part of the Schengen Area. A Schengen visa is not valid in Cyprus.
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Yes, Poland is part of the Schengen Area and Schengen visas are valid.
No. Morocco is not part of the Schengen Area.
Yes.There are no border controls between France and Monaco, so a Schengen visa is valid.
Yes, Switzerland is part of the Schengen Area. Schengen visas are valid.
A Schengen visa is typically valid for up to 90 days within a 180-day period for travel within the Schengen Area.