How to compare stability of gem diols?

If possible please give the rules to compare stability of gem diols.

Answer given is (A).

See relief in angle strain , in A there is maximum and in C there is least

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Can you please say the source from where to learn this concept ?
I think I missed out this concept.

Bro i don't have , i also learned this by questions , i think i have seen such things in solomon . You can check

Ok, thanks!

@Achyut_2020 you mean 1 is the most unstable na tab toh answer B hona chahiye.

Form the ketone and see its stability.
Less stable ketone equilibrium favor more toward gem diol.

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