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ইথাইল ইথায়োনেট এর সংকেত কোনটি?

C_{2} H_{5} - C O - O C_{2} H_{5}

C_{2} H_{5} - C O - O C H_{3}

C H_{3} - C O - O C_{2} H_{5}

C_{2} H_{5} - C O - C_{2} H_{2}

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