%chk=acetic_acid_conn.chk
%mem=2GB
%nprocshared=4
#p B3LYP/6-31G(d) EmpiricalDispersion=GD3BJ Opt Freq Geom=Connectivity

acetic acid, GaussView style input with connectivity table

0 1
C     0.000000    0.154560    0.000000
O     0.166384    1.360084    0.000000
O    -1.236449   -0.415036    0.000000
H    -1.867646    0.333582    0.000000
C     1.073776   -0.892748    0.000000
H     2.048189   -0.408135    0.000000
H     0.968661   -1.528353    0.881747
H     0.968661   -1.528353   -0.881747

 1 2 2.0 3 1.0 5 1.0
 2
 3 4 1.0
 4
 5 6 1.0 7 1.0 8 1.0
 6
 7
 8