The order of increasing sizes of atomic radii among the elements \(O , S, Se\) and \(As\) is

A \(As < S < O < Se\)
B \(Se < S < As < O\)
C \(O < S < Se < As\)
D \(O < S < As < Se\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(O < S < Se < As\)

Step-by-step Solution

Detailed explanation

On moving down in a group atomic radii increases due to successive addition of extra shell hence \(O < S < Se\) Further As is in group \(15\) having one less electron in its \(p\) orbital hence have higher atomic radii than group \(16\) elements. \(i.e.,\,\,O < S < Se< As\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Match \(List-I\) with \(List-II\)

\(List-I\)	\(List-II\)
\(A.\) Benzenesulphonyl chloride	\(I.\) Test for primary amines
\(B.\) Hoffmann bromamide reaction	\(II.\) Anti Saytzeff
\(C.\) Carbylamine reaction	\(III.\) Hinsberg reagent
\(D.\) Hoffmann orientation	\(IV.\) Known reaction of Isocyanates.

Choose the correct answer from the options given below.

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