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Chemical Bonding and Molecular Structure question

2025 · 7 Apr · Shift 2 · Q9
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Chemical Bonding and Molecular Structure question

2025 · 7 Apr · Shift 2 · Q9

JEE MainChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
Given below are two statements : Statement (I) : JEE Main 2025 (Online) 7th April Evening Shift Chemistry - Chemical Bonding & Molecular Structure Question 5 English 1 is more polar than JEE Main 2025 (Online) 7th April Evening Shift Chemistry - Chemical Bonding & Molecular Structure Question 5 English 2 Statement (II) : Boiling point of JEE Main 2025 (Online) 7th April Evening Shift Chemistry - Chemical Bonding & Molecular Structure Question 5 English 3 is lower than JEE Main 2025 (Online) 7th April Evening Shift Chemistry - Chemical Bonding & Molecular Structure Question 5 English 4 but it is more polar than JEE Main 2025 (Online) 7th April Evening Shift Chemistry - Chemical Bonding & Molecular Structure Question 5 English 5. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. A
    Both Statement I and Statement II are correct
  2. B
    Statement I is incorrect but Statement II is correct
  3. C
    Both Statement I and Statement II are incorrect
  4. D
    Statement I is correct but Statement II is incorrect
View written solutionFree

Correct answer: D

The formulas in the prompt are not rendered, but this standard bonding/polarity question is evidently comparing halogen compounds where Statement (II) says:

  • the boiling point of one compound is lower than another,
  • yet it is more polar than the other.

This kind of statement is typically correct, because boiling point depends strongly on molecular mass and dispersion forces, not only polarity.

However, the stored key says D, i.e. Statement I correct and Statement II incorrect. Let us analyze the chemistry principle carefully.

1. Principle for polarity

Molecular polarity depends on:

  1. bond polarity,
  2. molecular geometry,
  3. vector sum of bond dipoles.

So a lighter molecule can be more polar but still have lower boiling point than a heavier less polar molecule, because heavier molecules have stronger London dispersion forces.

Thus a statement of the form "Boiling point of X is lower than Y but X is more polar than Y"\text{"Boiling point of }X\text{ is lower than }Y\text{ but }X\text{ is more polar than }Y\text{"}"Boiling point of X is lower than Y but X is more polar than Y" is chemically very plausible and often true.

2. On Statement (II)

Because boiling point is not determined solely by polarity, Statement (II) is consistent with standard inorganic chemistry trends. For many common examples involving halides/interhalogens, the heavier molecule has the higher boiling point even if its dipole moment is smaller.

Hence Statement (II) should be correct, not incorrect.

3. On Statement (I)

Statement (I) says one species is more polar than another. Since the actual formulas are missing in the prompt, this cannot be checked directly from the text shown. But among the given options, if Statement (II) is correct, then possible answers reduce to:

  • A: both correct
  • B: Statement I incorrect, Statement II correct

The stored answer D requires Statement (II) to be incorrect, which is not supported by the chemistry trend.

Given the visible structure of the question, the most likely issue is that Statement (II) is correct, and therefore the stored key is likely wrong.

4. Best conclusion

Since the formulas are missing, Statement (I) cannot be definitively validated from the displayed text. But Statement (II) is chemically correct in the standard interpretation of such comparisons.

Therefore I do not agree with the stored answer D.

The most plausible corrected choice is:

  • B if Statement (I) is false,
  • or A if Statement (I) is true.

Because these questions commonly pair one wrong polarity comparison with one correct boiling-point-vs-polarity comparison, the most likely intended answer is B.

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