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JEE Main202116 Mar 2021Morning ShiftChemistryChemical Bonding and Molecular StructureActual

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : The H - O - H bond angle in water molecule is 104 . 5 ° . Reason R : The lone pair - lone pair repulsion of electrons is higher than the bond pair - bond pair repulsion.

Options

  1. AA is false but R is true
  2. BBoth A and R are true, but R is not the correct explanation of A
  3. CA is true but R is false
  4. DBoth A and R are true, and R is the correct explanation of A

Correct answer

D. Both A and R are true, and R is the correct explanation of A

Step-by-step solution

H 2 O θ = 104 . 5 ° The hybridisation of oxygen is water molecule is sp 3 . So electron geometry of water molecule is tetrahedral, and the bond angle should be 109 ° 28 ' ' but as we know that lone pair-lone pair repulsion of electrons is higher than the bond pair-bond pair repulsion because lone pair occupies more space around central atom than that of bond pair, The H - O - H bond angle in water molecule is 104 . 5 ° .

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