The church believes all of these except?

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I believe it is still A with the current state of things, but there is talk in the church of reforming to allow women priests.

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Determine the point groups for a. Ethane (staggered conformation) b. Ethane (eclipsed conformation) c. Chloroethane (staggered c

BlackZzzverrR [31]

Answer and Explanation:

Every molecule has a set of symmetry operations that helps in determining its overall symmetry. This set of operations determines the point group of a molecule.

(a) Ethane (staggered conformation)

Ethane in the staggered conformation has:

two $C_{3}$ axis (the C-C line)
3 perpendicular $C_{2}$ rotational axis bisecting the C-C line, in the plane of the two C's and H's on the opposite sides of the two C's
no σ $_{h}$ plane
but has 3σ $_{d}$ planes containing two carbons and anti two hydrogens

hence the point group of ethane in staggered conformation is  $D_{3d}$ 

(b) Ethane (eclipsed conformation)

Ethane in the eclipsed conformation has:

two $C_{3}$ axis (the C-C line)
three perpendicular $C_{2}$ axis (in the plane of the two C's and H's on the same side of the two C's)
mirror planes include σ $_{h}$ and 3σ $_{d}$

Hence the point group of ethane in eclipsed conformation is $D_{3h}$

(c) chloroethane (staggered conformation)

Chloroethane in the staggered conformation has:

no rotational axis

σ plane containing two carbons and chlorine and the anti hydrogen of Cl

Hence the point group of staggered conformation in chloroethane is $C_{s}$

(c) 1,2-Dichloroethane (staggered anti conformation)

1,2-Dichloroethane in the staggered anti conformation has:

$C_{2}$ axis perpendicular to the C-C bond and perpendicular to the plane of Cl-C-C-Cl
contain a σ $_{h}$ plane through Cl-C-C-Cl, and an inversion centre

Hence the point group in the staggered anti conformation of 1,2-Dichloroethane is $C_{2h}$