QJEEM25Ch6a80: JEE Main 2025 Chemistry - Class 11 JEEM25Ch6a80 Solution: Which of the following electronegativity order is incorrect?

Let’s compare the known electronegativities (Pauling scale) of the elements in each option:

F ~ 3.98

O ~ 3.44

N ~ 3.04

Cl ~ 3.16

C ~ 2.55

B ~ 2.04

S ~ 2.58 (sometimes listed as 2.5–2.58)

Si ~ 1.90

Al ~ 1.61

Be ~ 1.57

Mg ~ 1.31

Now, check each statement:

Option A: \mathrm{S}<\mathrm{Cl}<\mathrm{O}<\mathrm{F}

S (2.58) < Cl (3.16) < O (3.44) < F (3.98)

This order is correct.

Option B: \mathrm{Al}&lt;\mathrm{Si}&lt;\mathrm{C}&lt;\mathrm{N}

Al (1.61) < Si (1.90) < C (2.55) < N (3.04)

This order is correct.

Option C: \mathrm{Al}&lt;\mathrm{Mg}&lt;\mathrm{B}&lt;\mathrm{N}

Actual electronegativities are Al (1.61) and Mg (1.31).

The statement says “Al < Mg,” which would mean 1.61 < 1.31, which is wrong.

Therefore, Option C is incorrect.

Option D: \mathrm{Mg}&lt;\mathrm{Be}&lt;\mathrm{B}&lt;\mathrm{N}

Mg (1.31) < Be (1.57) < B (2.04) < N (3.04)

This order is correct.

Answer: Option C is the incorrect order.