Draw the three-dimensional structures of the molecules below. Determine if the compounds have any asymmetric carbons and if either of them are chiral despite not having any asymmetric carbons.
a. (CH₃)₂C=C=CHBr
b. H₂C=C=CHBr

Molecule 'a' has an asymmetric carbon while molecule 'b' does not.

Molecule 'b' has an asymmetric carbon while molecule 'a' does not.

Molecule 'a' is chiral while molecule 'b' is not.

Both molecules lack asymmetric carbon and both are achiral.