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কোনটি আলোক সক্রিয় যৌগ?

(C H_{3})_{2} C H C l

C H_{3} C H (C l) C H_{2} C H_{3}

C H_{3} C H_{2} C H_{2} C l

C l C H_{2} C H_{2} C H_{2} C l

ANS : 2

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