\(\,\xrightarrow{\,C{{H}_{3}}{{(C{{H}_{2}})}_{3}}.Br}\,\,\text{C}{{\text{H}}_{\text{3}}}\text{ - C}{{\text{H}}_{\text{2}}}\text{C }\equiv \text{ C - C}{{\text{H}}_{\text{2}}}\text{-C}{{\text{H}}_{\text{2}}}\text{-C}{{\text{H}}_{\text{2}}}\text{ -C}{{\text{H}}_{\text{3}}}\text{ }\)