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Periodic Table and Periodicity question

2025 · 22 Jan · Shift 1 · Q14
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Periodic Table and Periodicity question

2025 · 22 Jan · Shift 1 · Q14

JEE MainChemistryPeriodic Table and PeriodicityMCQ+4 / −1
Which of the following electronegativity order is incorrect?
  1. A
    S<Cl<O<F\mathrm{S}\lt \mathrm{Cl}\lt \mathrm{O}\lt \mathrm{F}S<Cl<O<F
  2. B
    Al<Si<C<N\mathrm{Al}\lt \mathrm{Si}\lt \mathrm{C}\lt \mathrm{N}Al<Si<C<N
  3. C
    Al<Mg<B<N\mathrm{Al}\lt \mathrm{Mg}\lt \mathrm{B}\lt \mathrm{N}Al<Mg<B<N
  4. D
    Mg<Be<B<N\mathrm{Mg}\lt \mathrm{Be}\lt \mathrm{B}\lt \mathrm{N}Mg<Be<B<N
View written solutionFree

Correct answer: C

  1. Use approximate Pauling electronegativity values

    Common electronegativity values are:

    F=3.98,O=3.44,Cl=3.16,S=2.58\mathrm{F}=3.98,\quad \mathrm{O}=3.44,\quad \mathrm{Cl}=3.16,\quad \mathrm{S}=2.58F=3.98,O=3.44,Cl=3.16,S=2.58 N=3.04,C=2.55,B=2.04,Si=1.90\mathrm{N}=3.04,\quad \mathrm{C}=2.55,\quad \mathrm{B}=2.04,\quad \mathrm{Si}=1.90N=3.04,C=2.55,B=2.04,Si=1.90 Be=1.57,Mg=1.31,Al=1.61\mathrm{Be}=1.57,\quad \mathrm{Mg}=1.31,\quad \mathrm{Al}=1.61Be=1.57,Mg=1.31,Al=1.61

  2. Check option A

    Given:

    S<Cl<O<F\mathrm{S}<\mathrm{Cl}<\mathrm{O}<\mathrm{F}S<Cl<O<F

    Using values:

    2.58<3.16<3.44<3.982.58<3.16<3.44<3.982.58<3.16<3.44<3.98

    This is correct.

  3. Check option B

    Given:

    Al<Si<C<N\mathrm{Al}<\mathrm{Si}<\mathrm{C}<\mathrm{N}Al<Si<C<N

    Using values:

    1.61<1.90<2.55<3.041.61<1.90<2.55<3.041.61<1.90<2.55<3.04

    This is correct.

  4. Check option C

    Given:

    Al<Mg<B<N\mathrm{Al}<\mathrm{Mg}<\mathrm{B}<\mathrm{N}Al<Mg<B<N

    But actual values are:

    Mg=1.31,Al=1.61,B=2.04,N=3.04\mathrm{Mg}=1.31,\quad \mathrm{Al}=1.61,\quad \mathrm{B}=2.04,\quad \mathrm{N}=3.04Mg=1.31,Al=1.61,B=2.04,N=3.04

    So correct increasing order should be:

    Mg<Al<B<N\mathrm{Mg}<\mathrm{Al}<\mathrm{B}<\mathrm{N}Mg<Al<B<N

    Hence the given order is incorrect.

  5. Check option D

    Given:

    Mg<Be<B<N\mathrm{Mg}<\mathrm{Be}<\mathrm{B}<\mathrm{N}Mg<Be<B<N

    Using values:

    1.31<1.57<2.04<3.041.31<1.57<2.04<3.041.31<1.57<2.04<3.04

    This is correct.

  6. Conclusion

    The incorrect electronegativity order is:

    C.\boxed{\text{C}}.C​.
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