BIOCHEMISTRY
POLAR AND NONPOLAR MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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there are no polar bonds in BCl3
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BCl3 has polar bonds, but they oppose one another and cancel-out to give a nonpolar molecule.
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boron is a metal, so the bond type is ionic and the term polar or nonpolar molecule does not apply.
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Detailed explanation-1: -Taking the example of BCl3 and NH3, you have non-polar BCl3 (because of its flat geometry and symmetrical distribution of electrons) forming a polar non-covalent bond with the NH3 molecule (polar because of its tetrahedral geometry with a lone-pair of electrons attached to the nitrogen).
Detailed explanation-2: -The difference in polarity is related to the fact that: A. BF3. has no hydrogen bonding and NH3 does.
Detailed explanation-3: -However, theBCl3 molecule is non-polar. This is because BCl3 is trigonal planar in shape. It is a symmetrical molecule. Hence, the respective dipole-moments of the B–Cl bond cancel each other, thereby causing a zero-dipole moment.
Detailed explanation-4: -Ammonia is a polar molecule because it has a positive charge on one end and a negative charge on the other. This makes it polar because the positive and negative charges are not evenly distributed. The reason ammonia (NH3) is a polar molecule is due to its uneven distribution of charges.