NTA Abhyas JEE Main2020ChemistryChemical Bonding and Molecular StructurePractice
In which of the following arrangements, the sequence is not strictly according to the property written against it?
Options
- ACO 2 < SiO 2 < SnO 2 < PbO 2 : increasing oxidising power
- BHF < HCl < HBr < HI : increasing acid strength
- CB < C < O < N : increasing first ionisation energy
- DNH 3 < PH 3 < AsH 3 < SbH 3 : increasing basic strength
Correct answer
D. NH 3 < PH 3 < AsH 3 < SbH 3 : increasing basic strength
Step-by-step solution
Drago's Rule :- In case of NH 3 , PH 3 , - - - bond angle decrease ,NH 3 ( ≈ 107 ° ) & PH 3 ( ≈ 90 ° ) So, %s character of lp in NH 3 is less & %s charactor of lp top to bottom increase so basic charactor decrease.