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C H_{3} - C H - C H - C H (C H_{3})_{2}

C H_{3} - C H_{2} - C H = C (C H_{3})_{2}

C_{4} H_{9} C H = C H_{2}

C_{2} H_{5} (C H_{3}) C = C H - C H_{3}

(C H_{3})_{2} C = C (C H_{3})_{2}

ANS : 2

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