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H H H H ι ι ι ι C = C + H_{2} = H - C - C - H

H O H H H ι ι ι ι H - C - C - H = C = C + H_{2} O

N a_{2} o + 2 H C l = 2 N a C l + H_{2} O

উপরে কোনোটি নয়

ANS : 3

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