%nprocshared=4
%mem=16GB
%chk=C2H2.chk
# opt freq 6-311++g(2d,2p) geom=connectivity wb97xd

Scaling factors

0 1
 C-C_1              0.00000000    0.00000000    0.60267300
 H-H_               0.00000000    0.00000000    1.66105500
 C-C_1              0.00000000    0.00000000   -0.60267300
 H-H_               0.00000000    0.00000000   -1.66105500

 1 2 1.0 3 3.0
 2
 3 4 1.0
 4