There is also an alkene CC double bond stretch at about 1650 cm -1 . The main band is a strong CH stretch from the CH 2 groups at about 3000 cm -1 . The CH stretch for the alkene CH is, as always, to the left of 3000 cm -1 . The CH 2 bend appears at about 1450 cm -1 . There is a very weak alkene CC double bond stretch at about 1650 cm -1 .
Every carbon has a single bond to a hydrogen.
Each carbon is bonded to two other carbons and the carbon-carbon bonds are alike for all six carbons. The molecule is planar. Two bands are caused by bending motions involving carbon-hydrogen bonds. It has a CH stretch, an OH stretch, a CO stretch and various bending vibrations. Likewise the CH stretch still appears at about 3000 cm -1 .