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নিম্নের কোনটি পিকরিক এসিড?

(N O_{2})_{3} C_{6} H_{2} (C H_{3})

(N O_{2})_{2} C_{6} H_{2} (C H_{3}) (O H)

(N O_{2})_{3} C_{6} H_{2} (O H)

(N O_{2})_{2} C_{6} H_{2} (O H) (N O_{2})

ANS : 3

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