Which of the following orders are correct against the property given? ( array lll (I) & Dipole moment & NF ₃ > NH ₃ > BF ₃ (II) & Covalent bond length & C - O > N - O > O - H (III) & Bond order & C ₂ > B ₂ > He ₂ array )

Step-by-step solution

(I) In ( BF ₃ ), electronegativity of ( F )-atom is greater than (B ). In ( NH ₃ ), electronegativity of ( N )-atom is greater than ( H ). Therefore, direction of all dipole moment with lone pairs lies in same direction, hence net dipole moment increases. ( _ net 1.46 D ) In ( NF ₃ ), electronegativity of ( F ) is greater than ( N ). Therefore, direction of dipole moment are opposite from the lone pair, hence, net dipole decreases. ( _ net 0.24 D ) Correct order of dipole moment will be ( NH ₃ > NF ₃ > BF ₃ . ) (II