Firstly, We calculate the IHD or Degree of Un saturation which comes out as = 4-5+1 = 0.
Since,
Rings count as one degree of unsaturation
Double bonds count as one degree of unsaturation
Triple bonds count as two degrees of unsaturation
The compound does not contain any rings/double bonds/triple bonds. We need to write only saturated straight chain isomers. I could draw following isomers with the last one having a chirality center.