Question

Which doesn't obey octet rule?
A. CO2 B. N2O4. C. H2SO4. D. NH3

Answer 1

Answer:

n2o4 option b is the answer

Explanation:

The octet rule is a chemical rule of thumb that reflects the observation that elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas. The rule is especially applicable to carbon, nitrogen, oxygen, and the halogens, but also to metals such as sodium or magnesium.

Answer 2

Answer:

N₂O₄ does not obey the octet rule.

Therefore, the option (B) is correct.

Explanation:

• In Octet rule, the atom should have eight electrons in its valence shell. If there is a compound made of two or more elements, then we add the number of electrons.
• If the number of electrons in the valence shell as like 16, 24, 32, etc. Because these numbers can be divided by 8 then we can say that the octet rule is followed.

1. CO₂ molecule: The number of valence electrons = 4  + 6 + 6 = 16. Because 16 is divisible by 8 therefore, CO₂ obeys octet rule.
2. N₂O₄ : The number of valence electrons = 10 + 4(6) =34. Because 34 is not divisible by 8, therefore, N₂O₄ doesn't obey octet rule.
3. H₂SO₄ :  The number of valence electrons = 2+ 6 + 4(6) = 32. Because 32 is divisible by 8, therefore H₂SO₄ follows octet rule.
4. NH₃ molecule: The number of valence electrons = 5 + 3(1) = 8. Therefore NH₃ molecule follows octet rule.