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IAT Full Mock 01 • Chemistry (Organic Reaction Mechanisms)
Q: An organic compound 'A' (C₄H₉Br) reacts with alcoholic KOH to give alkene 'B'. Ozonolysis of 'B' gives acetaldehyde as the only organic product. What is compound 'A'?
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Step-by-Step Derivation:

Alkene giving only acetaldehyde on ozonolysis must be 2-butene (CH₃-CH=CH-CH₃). 2-butene is formed by dehydrohalogenation of 2-bromobutane.

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