1) Not chiral 
<chemistry> A term used to describe a molecule which, in a given configuration, is superimposible on its mirror image. This is in contrast to chiral molecules which cannot be superimposed on their mirror images. ... (13 Nov 1997) ... 
Type: Term Pronunciation: ă-kī′răl Definitions: 1. Not chiral; denoting an absence of chirality.
acheiral, achiral A description of a molecule that has neither a left-handed nor a right-handed configuration.
not chiral.