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MCQEasyJEE 2023Electronegativity & Dipole Moment

JEE Chemistry 2023 Question with Solution

Given two statements about dipole moments:

Statement I: Dipole moment is a vector quantity and by convention it is depicted by a small arrow with tail on the negative center and head pointing towards the positive center.

Statement II: The crossed arrow of the dipole moment symbolizes the direction of the shift of charges in the molecules.

In the light of the above statements, choose the most appropriate answer from the options given below

  • A

    Both Statement I and Statement II are correct.

  • B

    Statement I is incorrect but Statement II is correct.

  • C

    Both Statement I and Statement II are incorrect.

  • D

    Statement I is correct but Statement II is incorrect.

Answer

Correct answer:B

Step-by-step solution

Standard Method

Given: Two statements about dipole moment notation.

Find: Which statement is correct.

From the provided solution text:

  • Statement I is said to be correct.
  • Statement II is said to be incorrect.

The solution explicitly concludes that the correct option is B.

There is a discrepancy between the option text and the solution explanation, because option B states that Statement I is incorrect and Statement II is correct, whereas the explanation states the opposite. Since the solution is the primary source and explicitly marks B as correct, the extracted answer is B.

Therefore, the correct option is B.

Explanation from the solution

Given: The question asks about the meaning of the dipole moment arrow.

Find: The most appropriate option.

The solution explanation states:

  1. Statement I is correct according to the explanation.
  2. Statement II is incorrect according to the explanation.

It further says that the crossed arrow indicates the direction of the resultant dipole moment and not the actual shift or movement of charges in the molecule.

However, the same the solution displays "The Correct Option is B". This does not match the wording of the listed options, where the statement matching the explanation is option D.

Because the Therefore, the extracted answer is B, with a noted source discrepancy.

Common mistakes

  • Students often confuse the direction of the dipole moment arrow with the physical movement of charges. The notation indicates polarity convention, not actual charge migration. Focus on what the symbol represents, not on imagined motion.

  • A common error is trusting only the option wording without checking the accompanying explanation. Here, the source itself contains a mismatch, so the conclusion must be taken from the solution authority as instructed.

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