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$A \overset{P C l_{5}}{\to} B \overset{N a}{\to} n$ -বিউটেন; A ও B যৌগদ্বয় হলো-

C H_{3} O H & C H_{3} C l

C H_{3} O H & C H_{3} C H_{2} C l

C H_{3} C H_{2} O H & C H_{3} C l

C H_{3} C H_{2} O H & C H_{3} C H_{2} C l

ANS : 4

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