Determine the point groups for a. Ethane (staggered conformation) b. Ethane (eclipsed conformation) c. Chloroethane (staggered conformation) d. 1,2-Dichloroethane (staggered anti conformation)

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:

hence the point group of ethane in staggered conformation is  

(b) Ethane (eclipsed conformation)

Ethane in the eclipsed conformation has:

Hence the point group of ethane in eclipsed conformation is

(c) chloroethane (staggered conformation)

Chloroethane in the staggered conformation has:

Hence the point group of staggered conformation in chloroethane is

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

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

Hence the point group in the staggered anti conformation of 1,2-Dichloroethane is

that's what i got you can count the number of atoms

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8