Which of the following is polar?Only one correct answerA.PCl5𝑃𝐶𝑙5B.PCl3𝑃𝐶𝑙3C.SF6𝑆𝐹6D.IF7𝐼𝐹7PreviousClearMark for Review & NextNextInstructionsEnglishNot VisitedNot AnsweredAnsweredMarked for ReviewAnswered & Marked for review(will be considered for evaluation)CHEMISTRYSection-ISection-II3132333435363738394041424344454647484950

The polar molecule among the options given is PCl3 (Phosphorus trichloride).

Here's why:

Polarity in a molecule occurs due to the unequal sharing of valence electrons; since electrons have a negative charge, the side with more electrons becomes a negative pole, while the side with fewer electrons is a positive pole.

A. PCl5 (Phosphorus pentachloride) is a nonpolar molecule because it has a trigonal bipyramidal structure which cancels out the electron pull on the phosphorus atom making it nonpolar.

B. PCl3 (Phosphorus trichloride) is a polar molecule because it has a pyramidal structure. The chlorine atoms are more electronegative and the charge distribution is not symmetrical making it a polar molecule.

C. SF6 (Sulfur hexafluoride) is a nonpolar molecule because it has an octahedral structure. The fluorine atoms are all symmetrically arranged around the sulfur atom, cancelling out any dipole moment and making the molecule nonpolar.

D. IF7 (Iodine heptafluoride) is a nonpolar molecule because it has a pentagonal bipyramidal structure. The fluorine atoms are symmetrically arranged around the iodine atom, cancelling out any dipole moment and making the molecule nonpolar.