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নিচের কোনটি সঠিক?

H - C_{H}^{H} - C_{H}^{H} - H

H - C_{H}^{H} - C_{H}^{H} - O - H

H - {C =}_{e t h y n e}^{H} C_{}^{H} - H

H - C_{H}^{H} - C_{H}^{H} - C_{H}^{H} - H

None

ANS : 4

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