EASY
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The molecular formula of benzonitrile is-

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Important Questions on Organic Chemistry- Some Basic Principles and Techniques

HARD
Which one of the following structures has the IUPAC name 3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?
MEDIUM
An organic compound AC4H10O on oxidation produces BC4H8OB forms oxime and shows iodoform reaction, but does not react with Fehling's solution. A and B are respectively.