Which of the following is an incorrect statement?

FeO is non stoichiometric. When interstitial compound is formed malleability and ductility are lost to a greater or lesser extent and the tenacity of the metal increases. Cu+ disproportionate to Cu2+ and elemental copper in solution.  Reduction using Lindlar's catalyst converts 2-butyne into trans-2-butene.

Reduction using Lindlar's catalyst converts 2-butyne into trans-2-butene.

Reduction using Lindlar's catalyst converts 2-butyne into cis-2-butene.