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The rotational constant (B) of H35Cl, H37Cl and D35Cl follow the order:
  • a)
    H35Cl > D35Cl > H37Cl
  • b)
    H35Cl > H37Cl > D35Cl
  • c)
    D35Cl > H35Cl > H37Cl
  • d)
    H37Cl > H35Cl > D37Cl
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The rotational constant (B) of H35Cl, H37Cl and D35Cl follow the order...
You have to calculate the reduced mass...
higher the reduced mass, lower the value of B...

since the reduced mass order would be :
D³⁵Cl > H³⁷Cl > H³⁵Cl
order of value of B (rotational constant) would be :
the opposite
H³⁵Cl > H³⁷Cl > D³⁵Cl

hence B is correct answer
Free Test
Community Answer
The rotational constant (B) of H35Cl, H37Cl and D35Cl follow the order...
The value of B decreases with isotopic substitution.
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