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Chemical Bonding and Molecular Structure question

2021 · 26 Feb · Shift 1 · Q6
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  5. /2021 · 26 Feb · Shift 1 · Q6

Chemical Bonding and Molecular Structure question

2021 · 26 Feb · Shift 1 · Q6

JEE MainChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Dipole-dipole interactions are the only non-covalent interactions, resulting in hydrogen bond formation. Reason R : Fluorine is the most electronegative element and hydrogen bonds in HF are symmetrical. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. A
    Both A and R are true and R is the correct explanation of A
  2. B
    A is true but R is false
  3. C
    A is false but R is true
  4. D
    Both A and R are true but R is NOT the correct explanation of A
View written solutionFree

Correct answer: C

  1. Analyze Assertion A

    Assertion A says:

    Dipole-dipole interactions are the only non-covalent interactions, resulting in hydrogen bond formation.

    This is false.

    • Hydrogen bonding is indeed a type of non-covalent interaction.
    • But it is not correct to say that dipole-dipole interactions are the only non-covalent interactions.
    • There are several other non-covalent interactions such as:
      • London dispersion forces
      • dipole-induced dipole interactions
      • ion-dipole interactions
      • ion-induced dipole interactions
      • van der Waals interactions, etc.

    Hence, Assertion A is false.

  2. Analyze Reason R

    Reason R says:

    Fluorine is the most electronegative element and hydrogen bonds in HF are symmetrical.

    Let us check both parts:

    • Fluorine is the most electronegative element: this is true.
    • In HF, due to the very high electronegativity of fluorine, strong hydrogen bonding occurs.
    • The hydrogen-bonded species in HF are commonly treated as having symmetrical hydrogen bonding in the associated structure.

    Therefore, Reason R is taken as true.

  3. Match with the options

    • Assertion A: False
    • Reason R: True

    Therefore, the correct option is:

    C\boxed{\text{C}}C​

    Option C: A is false but R is true.

  4. Compare with stored correct answer

    Stored correct answer: C

    Our derived answer matches the stored answer.

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