Question

The number of structural and configurational isomers of a brorno compound, $C_5 H_9 Br,$ formed by the addition of HBr to 2-pentyne respectively, are

• A. 1 and 2
• B. 2 and 4
• C. 4 and 2
• D. 2 and 1

Answer 1

Answer: (B)

2 and 4

Answer 2

$CH_3-C\equiv C-CH_2CH_3 + HBr \longrightarrow$
Therefore, two structural and four configurational isomers.