Assertion : Electronegativity of Al is greate | vedclass

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(C) The electronegativity of $Al$ is $1.61$ and that of $Tl$ is $1.62$. Thus,the electronegativity of $Tl$ is slightly greater than $Al$. Therefore,th

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Both Assertion $\&$ Reason are incorrect.

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(C) The electronegativity of $Al$ is $1.61$ and that of $Tl$ is $1.62$. Thus,the electronegativity of $Tl$ is slightly greater than $Al$. Therefore,the Assertion is incorrect.In the Boron family,due to the poor shielding effect of $d$ and $f$ orbitals (lanthanoid contraction),the atomic size does not increase regularly down the group. The size of $Ga$ is almost equal to $Al$. Therefore,the Reason is also incorrect.

Assertion $:$ Electronegativity of $Al$ is greater than $Tl$.
Reason $:$ In a Boron family,down the group regularly size increases.

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Assertion $:$ Electronegativity of $Al$ is greater than $Tl$.Reason $:$ In a Boron family,down the group regularly size increases.