সরবিক এসিড কোনটি?

CH3-CH=CH-CH2-COOH
CH3-CH=C=CH-COOH
CH3-CH=CH-CH=CH-COOH
CH3-CH2-CH2-=CH-COOH

সঠিক উত্তর: CH3-CH=CH-CH=CH-COOH

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