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MODEL PAPER 6 — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryMODEL PAPER 61 Mark
MCQ
Assertion (A): Boiling point of alkyl halides increases with an increase in molecular weight.
Reason (R): Boiling point of alkyl halides is in the order RI > RB > RCI > RF.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
✓

Answer

Correct option: A.
Both A and R are true and R is the correct explanation of A.
(a) Both A and R are true and R is the correct explanation of A.
Explanation: The greater the molecular mass, the stronger the van der Waals' forces of attraction and hence higher is the melting point/boiling point.

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