Consider the three following molecules and answer the questions below. HC≡CH H2C=CH2 H3C-CH3 (3 conformers with different symmetry) (a) For each molecule, including all conformers as indicated, draw the molecule, assign it to its point group, and draw on the diagram the symmetry elements that were used to make the assignment. State in each case whether or not the species is dipolar and/or chiral. (b) If one hydrogen atom in each molecule is substituted by a chlorine atom, sketch the new molecules and assign them to their point group. For this set of mono-chloro compounds: state the most common point group state how many are chiral state how many are dipolar state which molecule/conformer has the highest symmetry point group state which molecule/conformer has the lowest symmetry point group identify which of these molecules/conformers have three different H atom environments (c) For the dichlorinated versions of the molecules/conformers considered in part (a): state the most common point group for dichloroethene molecules identify which two 1,2-dichloro molecules/conformers have C2h point symmetry
Consider the three following molecules and answer the questions below.
HC≡CH
H2C=CH2
H3C-CH3 (3 conformers with different symmetry)
(a) For each molecule, including all conformers as indicated, draw the molecule, assign it to
its point group, and draw on the diagram the symmetry elements that were used to make
the assignment. State in each case whether or not the species is dipolar and/or chiral.
(b) If one hydrogen atom in each molecule is substituted by a chlorine atom, sketch the new
molecules and assign them to their point group. For this set of mono-chloro compounds:
state the most common point group
state how many are chiral
state how many are dipolar
state which molecule/conformer has the highest symmetry point group
state which molecule/conformer has the lowest symmetry point group
identify which of these molecules/conformers have three different H atom
environments
(c) For the dichlorinated versions of the molecules/conformers considered in part (a):
state the most common point group for dichloroethene molecules
identify which two 1,2-dichloro molecules/conformers have C2h point symmetry
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