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Although both NF3 and NCl3 are covalent, NCl3 undergoes hydrolysis whereas NF3 does not because:
  • a)
    NF3 is more stable than NCl3
  • b)
    Dipole moment of NF3 is more than NCl3
  • c)
    Electronegativity of F > Cl
  • d)
    Cl expand its octet by using d–orbitals. 
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Although both NF3 and NCl3 are covalent, NCl3 undergoes hydrolysis whe...
Explanation:

NCl3 and NF3 are both covalent molecules, but NCl3 undergoes hydrolysis whereas NF3 does not. The reason for this is that the chlorine atom in NCl3 has an expanded octet, while the nitrogen atom in NF3 does not. This means that chlorine can use its d orbitals to accommodate more electrons than it normally would be able to.

D-orbitals:
D-orbitals are the outermost orbitals in an atom, and they can be used to accommodate additional electrons beyond what is allowed by the octet rule. In NCl3, chlorine uses its d orbitals to accommodate the extra electrons from the water molecule during hydrolysis.

Expanded octet:
An expanded octet is when an atom has more than eight electrons in its outermost energy level. This is possible for atoms with d orbitals that can be used to accommodate additional electrons. Chlorine is one such atom, and it can accommodate up to 10 electrons in its outermost energy level.

Conclusion:
In conclusion, the reason why NCl3 undergoes hydrolysis while NF3 does not is that chlorine can expand its octet by using its d orbitals to accommodate the extra electrons from the water molecule. This is not possible for nitrogen in NF3, which does not have d orbitals and cannot accommodate additional electrons beyond the octet.
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Community Answer
Although both NF3 and NCl3 are covalent, NCl3 undergoes hydrolysis whe...
For a hydrolysis, a compound must have vacant orbitals to accept a lone pair of Oxygen. As in case of Nf3 it does not have any vacant orbitals to accept lone pair. So It cant Hydrolyse.
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Although both NF3 and NCl3 are covalent, NCl3 undergoes hydrolysis whereas NF3 does not because:a)NF3 is more stable than NCl3b)Dipole moment of NF3 is more than NCl3c)Electronegativity of F > Cld)Cl expand its octet by using d–orbitals.Correct answer is option 'D'. Can you explain this answer?
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