Chemistry, 04.07.2019 08:10 trint5952

Using the idea of electronegativity difference for predicting polarity of bonds and considering the shape of the following molecules, match the compounds in the order of strongest to weakest expected polarity. (1 = strongest; 5 = weakest) hbr i2 hf hcl hi

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See electronegativity is the tendency of an atom to gain an electron and flourine with a valecy of one and a vey small size is the most electronegetive because its orbitals are quite closed to the nucleus and hence the attraction is quite strong so it can attract an electron.the question that arises is that some smaller atoms should be more electronegetive as they are closer to the nucleus but it need more energy for them as compared to flourine to complete their octet. now polarity increases when two atoms of quite different sizes form a compound ... the more electronegetive atom will always attract the bond pair forming a negetive charge on it and positive on the less electroneg. one and polarity increases with electronegetivity of the anion.now as your question says
5=I2.. because both the atoms are same there wont be permanent polarity
4=HI iodine is the least electronegetive of all the halogens due to its large size,electronegetivity decreases down the group
3=HBr bromine is the 2nd largest halogen
2=HCl chlorine is the 3rd largest halogen
1=HF fluorine is the smallest halogen making and hence makes the most polar

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vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in $h_{2}s$ , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between $h_{2}s$ molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent $h_{2}s$ molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

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conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

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Using the idea of electronegativity difference for predicting polarity of bonds and considering the...