Question

6.3 un pas mujecu a pair of scissors Show the planes and centers of symmetry (if any) in cach of the following achiral objects. (a) the methane molecule (b) a cone (c) the ethylene molecule (d) the trans-2-butene molecule (e) the cis-2-butene molecule the anti conformation of butane

Answer 1

0.) Methane Mokeute (Chu) С " НА All the it's are identical and it contain 6 places of symmetry, which are passing through and reflecting (1) C, Ha, ho - He, he (II) C, Ha, He (1) Cha, Hd (II) C, Hb, He Plane. I (I) C, Hb, Hd (I) C, Hc, Hel Halho b) Cone Le contains enfinite planes of symmetry < > Because for every rotation of - this plane, you get a - plane of symmetry in the plane of paper berpendicular to plan of paper c) Ethylene (CH4) — 3 planes of Syrimetry - a center of symmetry " center of symmetry

C=CH = = C = C RH in the plan. perpendicular to plame of paper d.) traus - 2- butene chigi el planes of eyoumetry CFCH and dHz - center of a center of symmetry mmm In the - e-) Cis-2- butene H H i 2 plane of symmetry In the plane of nga dus F c - Perpendicular to place of f) Arte conformetion of Batane H 1 centre of symmetry and a plane of symmetry HC Cha 0 Plane containing both the Hy molecule at the same е и time.