The term ‘isoelectronic’ means the same number of electrons strictly. This refers to the total (Core + Valence) number of electrons. But this isoelectronic is often used for the species having same number of valence electrons. With respect to same number of valence electrons how many of the following species are isoelectronic, having regular shapes without any distortion and with zero dipolemoment.
$B e C l_{2} (g a s), Z n C l_{2}, C d C l_{2}, H g C l_{2}, C O_{2}, S O_{2}, S n C l_{2}, S C l_{2}, N O_{2}, N_{2} O$

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answer is 4.

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Detailed Solution

Solution only $B e C l_{2}, Z n C l_{2}, C d C l_{2}$ and $H g C l_{2}$ are linear with zero dipolemoment and are isoelectronic with respect to valence electrons.

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