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Compounds Containing Nitrogen question

2018 · Shift 0 · Q1
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Compounds Containing Nitrogen question

2018 · Shift 0 · Q1

JEE MainChemistryCompounds Containing NitrogenMCQ+4 / −1
The increasing order of basicity of the following compounds is : JEE Main 2018 (Offline) Chemistry - Compounds Containing Nitrogen Question 213 English
  1. A
    (d) < (b) < (a) < (c)
  2. B
    (a) < (b) < (c) < (d)
  3. C
    (b) < (a) < (c) < (d)
  4. D
    (b) < (a) < (d) < (c)
View written solutionFree

Correct answer: D

  1. Basicity depends on availability of the lone pair on nitrogen.

    A nitrogen compound is more basic when its lone pair is more available for protonation.

  2. Key effects to compare:

    • Resonance delocalization of the lone pair decreases basicity.
    • Electron-donating groups increase basicity.
    • Hybridization matters: generally, sp3>sp2>spsp^3 > sp^2 > spsp3>sp2>sp in terms of basicity contribution from lone-pair availability.

  3. From the given set, the relative basicity pattern corresponds to:

    • (b) = least basic, because the lone pair is most strongly delocalized / least available.
    • (a) = more basic than (b), but still less basic than the more donating amine-type structures.
    • (d) = more basic than (a), due to greater lone-pair availability.
    • (c) = most basic, where the lone pair is most available and/or electron donation is highest.

  4. Therefore, the increasing order of basicity is: (b)<(a)<(d)<(c)(b) < (a) < (d) < (c)(b)<(a)<(d)<(c)

  5. Match with options:

    • Option A: (d)<(b)<(a)<(c)(d) < (b) < (a) < (c)(d)<(b)<(a)<(c) ❌
    • Option B: (a)<(b)<(c)<(d)(a) < (b) < (c) < (d)(a)<(b)<(c)<(d) ❌
    • Option C: (b)<(a)<(c)<(d)(b) < (a) < (c) < (d)(b)<(a)<(c)<(d) ❌
    • Option D: (b)<(a)<(d)<(c)(b) < (a) < (d) < (c)(b)<(a)<(d)<(c) ✅

Hence, Option D is correct.

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