Which of the following molecules does not have a geometric isomer? Which of the following molecules does not have a geometric isomer? MX3Y3 (octahedral shape). A central metal atom is bonded left into and out of the page and right into the page to X, and above, below, and right out of the page to Y. MX4Y2 (octahedral shape). A central metal atom is bonded right into and out of the page and left into and out of the page to four Xs, and above and below to Y. MX3Y (tetrahedral shape). A central metal atom is single bonded to three Xs above and right into and out of the page, and left to Y. MX2Y2 (square planar shape). A central metal atom is single bonded right to two Ys and left to two Xs.