Which of the following compounds can exist?

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(D) $SH_6$ does not exist because sulfur cannot expand its coordination number to $6$ with hydrogen due to steric hindrance and bond energy constraint

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$HClO_3$

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(D) $SH_6$ does not exist because sulfur cannot expand its coordination number to $6$ with hydrogen due to steric hindrance and bond energy constraints.$HFO_4$ does not exist because fluorine is the most electronegative element and cannot exhibit positive oxidation states.$FeI_3$ is unstable because $Fe^{3+}$ is a strong oxidizing agent and $I^-$ is a strong reducing agent,leading to the spontaneous reduction of $Fe^{3+}$ to $Fe^{2+}$ and oxidation of $I^-$ to $I_2$.$HClO_3$ (chloric acid) is a stable and well-known oxoacid of chlorine.

Element	Electronegativity Value
$W$	$2.7$
$X$	$2.1$
$Y$	$0.8$
$Z$	$3.4$

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Element Electronegativity Value
$W$ $2.7$
$X$ $2.1$
$Y$ $0.8$
$Z$ $3.4$
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