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ইথোক্সিপ্রোপেন কোনটি?

C H_{3} - C H_{2} - 0 - C H_{2} - C H_{2}

C H_{3} - C H_{2} - C H_{2} - 0 - C H_{3}

C H_{3} - 0 - C H_{3}

C H_{3} - C H_{3} - C H_{2} - 0 - C H_{2} - C H_{3}

ANS : 4

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