Question

Which of the following molecules do not have hybridisation?

• A. $As{H}_3$
• B. $H_{2}S$
• C. $H_{2}Se$
• D. All of the above

Answer 1

The correct option is D All of the above

According to Drago's Rule, If the central atom belongs to the groups 15 or 16 (and is from third or higher period) and is surrounded by atoms having electronegativity less than 2.5, it does not involve hybridization.
Therefore, $As{H}_3$, $H_{2}S$ and $H_{2}Se$ do not have hybridisation.