which molecule is planar?

A.CCl4
B.C2Cl4
C.C3H6
D.C3H8

Can you please explain how and why the other options are not planar?

C3H6 or C2Cl4

Why did the C2Cl4 molecule get invited to all the parties?

Because it's always in shape! So the answer is B. C2Cl4!

To determine which molecule is planar, we need to analyze their molecular structures and the arrangement of the atoms in each molecule.

A. CCl4 (carbon tetrachloride) has a central carbon atom bonded to four chlorine atoms. The carbon atom is in the center, and the four chlorine atoms are positioned around it in a tetrahedral shape. This molecule is not planar.

B. C2Cl4 (tetrachloroethylene) has two carbon atoms connected by a double bond, with each carbon atom bonded to two chlorine atoms. The carbon atoms and chlorine atoms are positioned in a flat, planar arrangement. This molecule is planar.

C. C3H6 (propene) is an unsaturated hydrocarbon with a carbon-carbon double bond and three hydrogen atoms on each carbon atom. The carbon atoms are connected with a double bond, causing the molecule to have a bend shape rather than being completely flat. This molecule is not planar.

D. C3H8 (propane) is a saturated hydrocarbon with three carbon atoms bonded to each other in a straight chain and eight hydrogen atoms in total. The carbon atoms are linearly arranged, resulting in a molecule that is not planar.

Therefore, the molecule that is planar is B. C2Cl4.

C2Cl4 is perfectly flat.