Question

structure of 3,4-dibromo-2-pentanone

Answer 1

as it shows pentane,
draw 5 carbon atoms first.
" one"shows ketones group so satisfy with double bond O.
di bromo states 2 bromine atoms at the 3 rd and 4th place.

         O     Br       Br
         II      I          I
CH3 CH CH CH CH3

hope it helps!!!