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A organic compound has 42.1% carbon, 6.4 % hydrogen and remainder is oxygen. If its molecular weight is 342, then its molecular formula is :

1. C 11 H 18 O 12
2. C 12 H 20 O 12
3. C 14 H 20 O 10
4. C 12 H 22 O 11

Correct answer: C 12 H 22 O 11

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