The order of increasing sizes of atomic radii among the elements $O, S, Se$ and $As$ is :
- $As < S < O < Se$
- $Se < S < As < O$
- $O < S < As < Se$
- $O < S < Se < As$
The Correct Option is D
Solution and Explanation
$O < S < Se$
Further As is in group 15 having one less electron in its $p$ orbital hence have higher atomic radii than group 16 elements.
i.e.,$O < S < Se < As$
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Concepts Used:
Haloalkanes and Haloarenes - Classification
Classification of Haloalkanes and Haloarenes are as follows:
Haloalkanes and Haloarenes are Classified on the Basis of the Number of Halogen Atoms:
These are further classified as mono, di, or polyhalogen (tri-,tetra-, etc.) compounds depending on whether they contain one, two or more halogen atoms in their structures. For example;
- Monohaloalkane
- Dihaloalkane
- Trihaloalkane
Haloalkanes and Haloarenes are Classified on Compounds Containing sp3 C—X Bond (X= F, Cl, Br, I)
This class includes:
- Alkyl halides or haloalkanes (R—X)
- Allylic halides
- Benzylic halides
Haloalkanes and Haloarenes are Classified on Compounds Containing sp2 C—X Bond
This class includes:
- Vinylic halides
- Aryl halides