are there any substances which tur from gas to solids

Answer given by your friend is correct, few more examples are camphor vapours, naphthalene vapours, iodine vapours, etc. 
You may refer to the following link for details.
https://www.meritnation.com/ask-answer/question/what-is-the-meaning-of-deposition/matter-in-our-surroundings/5770390

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Yes there are subtancesome which directly turn from gases to solI'd this process is known as deposition substances like carbon dioxide directly turns from carbon dioxide into dry ice

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