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Chains, Branches and Rings

The number of...

Question

The number of structural and configurational isomers of a bromo compound, $C_{5} H_{9} B r$ , formed by the addition of one mole HBr to 2-pentyne respectively are

A

1 and 2

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B

2 and 4

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C

4 and 2

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D

2 and 1

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Solution

The correct option is B 2 and 4
Addition of HBr of 2-pentyne gives two structural isomers.
$C H_{3} - C \equiv C - C H_{2} C H_{3} H B r - -- \to C H_{3} C (B r) = C H C H_{2} C H_{3} + C H_{3} C H = C (B r) C H_{2} C H_{3}$
Each one of these will exist as a pair of geometrical isomers. Thus, there are two structural and four configurational isomers.
Hence, the correct answer is option (b).

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Chains, Branches and Rings

Standard X Chemistry

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