Which of the following statements are true. (i) In the structure of HNO 3 , the N − O bond ( 121 pm ) is shorter than the N − OH bond ( 140 pm ) . (ii) All the P − Cl bonds in PCl 5 are not equivalent. (iii) I − Cl is more reactive than I 2 .

Question

Which of the following statements are true. (i) In the structure of HNO 3 , the N − O bond ( 121 pm ) is shorter than the N − OH bond ( 140 pm ) . (ii) All the P − Cl bonds in PCl 5 are not equivalent. (iii) I − Cl is more reactive than I 2 ., (i) and (ii), (ii) and (iii), (i) and (iii), (i),(ii) and (iii)

MARKS App · Accepted Answer

(i) N − O bond is shorter than N − OH bond in HNO 3 molecule. It can be understood with the help of resonating structures of HNO 3 molecule. As we can see from the resonating structures, there is double bond character between N − O bonds but there is always single bond character between N − OH bond. This is because of no pi-bonding occurring between nitrogen and oxygen of − OH group. Double bond is shorter than single bond. So N − O bond is shorter than N − OH bond in HNO 3 molecule. (ii) There are two bonds in PCl 5 . One is equatorial and other is axial, because of the repulsion factor one is longer and the other shorter. (iii) I − Cl bond is weaker than I − I bond

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