u are absolutely right.The shape of the molecules is based on VSPER theory [ Valency Shell Electron Pair Repulsion ] Theory.Let us see some of the Salient features of this theory and some examples,➠ The shape of the molecule and the bond angle depends on the repulsion between electron PAIRS present in valency shell of central atom.➠ Electron in central atoms are of two types⠀⠀⠀⠀⠀⠀❆ Bond Pair ❆⠀⠀⠀⠀⠀⠀❆ Lone pair ❆➠ Pair of electrons in the valency shell should REPEL one another since they have negative charge in their valency cloud.➠ The extent of repulsion between also depends on the Electronegativity difference between two bonded atoms.➠ The repulsion between electron pair is given as ➠ Repulsion between 2 single BONDS will be lesser than 2 double bonds.➠ According to VSEPR Theory electron pair will be arranged around the central atom with least POSSIBLE repulsions {i.e} Max possible gap should be maintained.➠ A multiple bond is treated as if it has single electron pair.✧ Bond Pair - Has No lone pair of electrons ✧✧ Lone Pair - Has LEFT lone pair of electrons ✧➠ In the given VSPER molecule H will involve single bond, Halogen will involve Single bond, O will involve double bond & N will involve triple bond -These are some of the salient features of VSPER theory.Some of the shapes and Bond angles of VSPER theory are,1.) Linear - 180°2.) Trigonal Planar - 120°3.) Tetrahedral - 109.28°4.) Trigonal Bipyramidal -180°,120°,90°5.) See saw shape = >120° and >90°6.) T shaped - < 90°7.) Octahedral - 90°8.) Square planar - 90°9.) Pentogonal Bipyrimdal - 90°&72°10.) Disorted octahedral - all angles ≠ 90°ℌope ℑt ℌelpsThanks for asking :)