How many unsaturated bond(s) are present in the product of the following reaction?

1-hexene $+ B r_{2} / C C l_{4}$ then $N a N H_{2}$

(Give your answer in integer)

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Solution

1-hexene reacts with $B r_{2} / C C l_{4}$ to form 1,1-dibromohexane.

$C H_{3} C H_{2} C H_{2} C H_{2} C H = C H_{2} + B r_{2} / C C l_{4} ⟶ C H_{3} C H_{2} C H_{2} C H_{2} C H_{2} C H B r_{2}$

When 1,1-dibromohexane is treated with sodaamide , it undergoes dehydrobromination to form 1-hexyne.

$C H_{3} C H_{2} C H_{2} C H_{2} C H_{2} C H B r_{2} + N a N H_{2} / N H_{3} d e h y d r o b r o m i n a t i o n - ----------- \to C H_{3} C H_{2} C H_{2} C H_{2} C \equiv C H$

Hence, the correct answer is $1$

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