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বিউটাইন-1এর গাঠনিক সংকেত কোনটি?

C H_{3} - C H_{2} - C H_{2} - C \equiv C H

C H_{3} - C H_{2} - C H_{2} - C H = C H_{2}

H C \equiv C - C H_{2} - C H_{2} - C H_{3}

{CH}_{3} - {CH}_{2} - C \equiv CH

ANS : 4

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