Multiple choice

In compounds of type ECl3, where E = B, N, P or As, the angles Cl - E - Cl for different E are in the order:

  1. BCl3 > NCl3 > PCl3 > AsCl3

  2. AsCl3 > PCl3 > NCl3 > BCl3

  3. BCl3 > AsCl3 > PCl3 > NCl3

  4. BCl3 > PCl3 > NCl3 > AsCl3

  5. AsCl3 > NCl3 > PCl3 > BCl3
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A Correct answer
Explanation

BCl3 : sp2 hybridization, trigonal planar shape, bond angle 120o NCl3 , PCl3 , AsCl3 : sp3 hybridization, trigonal pyramidal shape, bond angle <109o 28’ and decreases from NCl3 to AsCl3 Hence, correct order of Cl-E-Cl bond angel is BCl3 > NCl3 > PCl3 > AsCl3

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