which of the following molecules are non polar 1. PbCl4 2. BF3 3. SnCl2 4. CS2
a) 1, 2, 3
b) 1, 2, 3, 4
c) 1, 2, 4
d) 2, 3, 4
please also mention what is the method with which we can find if a molecule is polar and non polar ,with structures and proper explanation if possible
Answers
Answered by
19
your answer is c.Among the given options PbCl4,BF3 and CS2 are non polar.A nonpolar bond arises when the electronegativity of the two atoms are almost equal.If there is a great difference in electronegativity the resultant bond will be polar which is also known as ionic.In nonpolar bond equal sharing of bond electrons will occur.
poonam85ttovn20g:
thanks but then in order to find the correct answer do i have to memorize the electronegativities of different elements ? bcoz they can put any compound in the question so ..... how to learn so many values or is there any simple trick
By using periodic trends you have to remember the electronegativities of different elements.This is the only way to find whether the given compound is polar or nonpolar.I think you know this i.e.,in periods E.N increases and in groups E.N decreases.If the difference in electronegativity for the atoms in a bond is greater than 0.4, we consider the bond polar. If the difference in electronegativity is less than 0.4, the bond is essentially nonpolar.There is no simple trick expect periodicity.
okay thanks!!
Answered by
26
Answer: c
Explanation: The answer can be understood in terms of dipole moment of molecules. Those molecule which have zero dipole moment are non polar and vice- versa. PbCl4 have tetrahedral, BF3 have trigonal planar and CS2 have linear structure which all are symmetrical making dipole moment zero. Since Sncl2 have bent shape (having 1 lone pair also) its dipole moment not equal to zero making it polar in nature.
Thank you.
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