નીચે આપેલા સંયોજનો માટે \(pK_a\), મૂલ્યોનો સાયો ક્રમ શોધો.

A \(c > a > d > b\)
B \(b > d > a > c\)
C \(b > a > d > c\)
D \(a > b > c > d\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(b > d > a > c\)

Step-by-step Solution

Detailed explanation

Due to \(- M\) effect of \(- NO _2\) group, it increases acidity \(+ M\) effect of \(N \left( CH _3\right)_2\) decreases acidity. Hyperconjugation of isopropyl decrease acidity \(\therefore\) order of acidic strength \((c) > (a) > (d) > (b)\)

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.

Same subject

નીચેનામાંથી કઈ ધાતુ સરળતાથી મધ્યવર્તી હાઇડ્રાઇડ બનાવે છે?

JEE Mains 2021 Medium

યાદી \(I\) ને યાદી \(II\) સાથે જોડો

યાદી \(I\) (અવક્ષેપક પ્રક્રિયક અને પરિસ્થિતિઓ)	યાદી \(II\) (ધનાયન)
\((A)\) \(\mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH}\)	\((I)\) \(\mathrm{Mn}^{2+}\)
\((B)\) \(\mathrm{NH}_4 \mathrm{OH}+\mathrm{Na}_2 \mathrm{CO}_3\)	\((II)\) \(\mathrm{Pb}^{2+}\)
\((C)\) \(\mathrm{NH}_4 \mathrm{OH}+\mathrm{NH}_4 \mathrm{Cl}+\mathrm{H}_2 \mathrm{S}\) gas	\((III)\) \(\mathrm{Al}^{3+}\)
\((D)\) dilute \(\mathrm{HCl}\)	\((IV)\) \(\mathrm{Sr}^{2+}\)

નીચે આપેલા વિકલ્પોમાંથી સાચો જવાબ પસંદ કરો:

JEE Mains 2024 Medium

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