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Which of the following statements regarding mass spectrometry is wrong?
- a)In a normal mass spectrometer, electron impact causes a molecule to lose an electron and become a molecular radical cation which decomposes into fragment cations and radicals.
- b)Only cations can be detected by a normal mass spectrometer.
- c)A compound whose molecules contain just one bromine atom shows two molecular ion peaks of similar intensity, one at +1 and one at -1 of the average m/z value.
- d)Molecular ion peaks always have even-numbered values of m/z.
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which of the following statements regarding mass spectrometry is wrong...
The molecular mass of a molecule containing one nitrogen atom, for example, is an odd number of atomic mass units, so its molecular ion peak has an odd numbered m/z ratio; statement (d) is wrong.
Most Upvoted Answer
Which of the following statements regarding mass spectrometry is wrong...
Understanding Mass Spectrometry
Mass spectrometry is a powerful analytical technique used to identify compounds based on their mass-to-charge ratio (m/z). It is essential to understand the nuances of molecular ion peaks and their characteristics.
Statement D: Explanation
The statement "Molecular ion peaks always have even-numbered values of m/z" is incorrect for the following reasons:
- Molecular Ion Peaks: The molecular ion peak corresponds to the intact molecule's mass, which can be odd or even depending on the molecular formula.
- Odd and Even M/z Values: Compounds with an odd number of nitrogen atoms or certain isotope distributions (like halogens) can lead to molecular ions with odd m/z values. For example, a molecule with one nitrogen atom will typically yield an odd m/z value because nitrogen has an atomic mass of about 14.
- Example of Bromine: A compound containing just one bromine atom will exhibit two peaks due to the presence of different isotopes (Br-79 and Br-81). These peaks will be centered around the average m/z value, potentially yielding odd and even values.
Conclusion
In summary, molecular ion peaks can exhibit both odd and even m/z values based on the molecular structure and isotopic composition. Therefore, statement D is incorrect, as it inaccurately claims that molecular ion peaks only have even-numbered m/z values.
Mass spectrometry is a powerful analytical technique used to identify compounds based on their mass-to-charge ratio (m/z). It is essential to understand the nuances of molecular ion peaks and their characteristics.
Statement D: Explanation
The statement "Molecular ion peaks always have even-numbered values of m/z" is incorrect for the following reasons:
- Molecular Ion Peaks: The molecular ion peak corresponds to the intact molecule's mass, which can be odd or even depending on the molecular formula.
- Odd and Even M/z Values: Compounds with an odd number of nitrogen atoms or certain isotope distributions (like halogens) can lead to molecular ions with odd m/z values. For example, a molecule with one nitrogen atom will typically yield an odd m/z value because nitrogen has an atomic mass of about 14.
- Example of Bromine: A compound containing just one bromine atom will exhibit two peaks due to the presence of different isotopes (Br-79 and Br-81). These peaks will be centered around the average m/z value, potentially yielding odd and even values.
Conclusion
In summary, molecular ion peaks can exhibit both odd and even m/z values based on the molecular structure and isotopic composition. Therefore, statement D is incorrect, as it inaccurately claims that molecular ion peaks only have even-numbered m/z values.
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Which of the following statements regarding mass spectrometry is wrong?a)In a normal mass spectrometer, electron impact causes a molecule to lose an electron and become a molecular radical cation which decomposes into fragment cations and radicals.b)Only cations can be detected by a normal mass spectrometer.c)A compound whose molecules contain just one bromine atom shows two molecular ion peaks of similar intensity, one at +1 and one at -1 of the averagem/zvalue.d)Molecular ion peaks always have even-numbered values ofm/z.Correct answer is option 'D'. Can you explain this answer? for Chemistry 2025 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Which of the following statements regarding mass spectrometry is wrong?a)In a normal mass spectrometer, electron impact causes a molecule to lose an electron and become a molecular radical cation which decomposes into fragment cations and radicals.b)Only cations can be detected by a normal mass spectrometer.c)A compound whose molecules contain just one bromine atom shows two molecular ion peaks of similar intensity, one at +1 and one at -1 of the averagem/zvalue.d)Molecular ion peaks always have even-numbered values ofm/z.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Chemistry 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements regarding mass spectrometry is wrong?a)In a normal mass spectrometer, electron impact causes a molecule to lose an electron and become a molecular radical cation which decomposes into fragment cations and radicals.b)Only cations can be detected by a normal mass spectrometer.c)A compound whose molecules contain just one bromine atom shows two molecular ion peaks of similar intensity, one at +1 and one at -1 of the averagem/zvalue.d)Molecular ion peaks always have even-numbered values ofm/z.Correct answer is option 'D'. Can you explain this answer?.
Which of the following statements regarding mass spectrometry is wrong?a)In a normal mass spectrometer, electron impact causes a molecule to lose an electron and become a molecular radical cation which decomposes into fragment cations and radicals.b)Only cations can be detected by a normal mass spectrometer.c)A compound whose molecules contain just one bromine atom shows two molecular ion peaks of similar intensity, one at +1 and one at -1 of the averagem/zvalue.d)Molecular ion peaks always have even-numbered values ofm/z.Correct answer is option 'D'. Can you explain this answer? for Chemistry 2025 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Which of the following statements regarding mass spectrometry is wrong?a)In a normal mass spectrometer, electron impact causes a molecule to lose an electron and become a molecular radical cation which decomposes into fragment cations and radicals.b)Only cations can be detected by a normal mass spectrometer.c)A compound whose molecules contain just one bromine atom shows two molecular ion peaks of similar intensity, one at +1 and one at -1 of the averagem/zvalue.d)Molecular ion peaks always have even-numbered values ofm/z.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Chemistry 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements regarding mass spectrometry is wrong?a)In a normal mass spectrometer, electron impact causes a molecule to lose an electron and become a molecular radical cation which decomposes into fragment cations and radicals.b)Only cations can be detected by a normal mass spectrometer.c)A compound whose molecules contain just one bromine atom shows two molecular ion peaks of similar intensity, one at +1 and one at -1 of the averagem/zvalue.d)Molecular ion peaks always have even-numbered values ofm/z.Correct answer is option 'D'. Can you explain this answer?.
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