Which of the following molecules has the most | vedclass

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(C) The polarity of a covalent bond depends on the difference in electronegativity between the bonded atoms. Greater the difference in electronegativi

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$HCl$

Vedclass · Answer

(C) The polarity of a covalent bond depends on the difference in electronegativity between the bonded atoms. Greater the difference in electronegativity,the more polar the bond. The electronegativity values of halogens are: $F > Cl > Br > I$. Since hydrogen $(H)$ is common in all,the polarity depends on the electronegativity of the halogen. The electronegativity difference is maximum for $H-Cl$ compared to $H-Br$ and $H-I$,while $H-H$ is non-polar. Therefore,$HCl$ has the most polar covalent bond among the given options.

Which of the following molecules has the most polar covalent bond?

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The observed dipole moment of $HCl$ is $1.303 \ D$. This indicates that $HCl$ has $17 \%$ ionic and $83 \%$ covalent character. The bond length of $HCl$ is $1.26 \ \mathring{A}$ and the charges on $H$ and $Cl$ ions are $+e$ and $-e$. Calculate the theoretical dipole moment in $D$.

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