MCQ
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.

  • A
    $A $ is false but $R$ is true
  • B
    Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
  • C
    $A$ is true $R$ is false
  • D
    Both $A$ and $R$ are true but $R$ is $NOT$ the correct explanation of $A$

Answer

Assertion is incorrect since in hydrogen bonding, Dipole-dipole interactions are noncovalent but ion-dipole interaction can also result in $H$ -bond formation. Reason is correct since $F$ is most electronegative element $\&$ structure is

Symmetrical $H-$bonds are present

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