QuestionMay 31, 2025

Which molecular formula has molecular ions ration as: M+/[M+2]+=1/1 C7H18Cl2 C9H1OCl C10H16Br2 C11H14Br None of the above

Which molecular formula has molecular ions ration as: M+/[M+2]+=1/1 C7H18Cl2 C9H1OCl C10H16Br2 C11H14Br None of the above
Which molecular formula has molecular ions ration as: M+/[M+2]+=1/1 C7H18Cl2 C9H1OCl C10H16Br2 C11H14Br None of the above

Solution
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Answer

C10H16Br2 Explanation 1. Identify the isotopic contribution The M+/[M+2+] ratio of 1/1 suggests a significant isotopic effect, typically seen with bromine (Br) due to its isotopes ^{79}Br and ^{81}Br, which are nearly equal in abundance. 2. Analyze each option for bromine presence Check if the molecular formula contains bromine. Only C10H16Br2 and C11H14Br contain bromine. 3. Calculate isotopic ratio for bromine-containing formulas For C10H16Br2: Two bromine atoms contribute to the M+/[M+2+] ratio of approximately 1/1. For C11H14Br: One bromine atom contributes to a different ratio, not 1/1.

Explanation

1. Identify the isotopic contribution<br /> The $M+/[M+2+]$ ratio of 1/1 suggests a significant isotopic effect, typically seen with bromine (Br) due to its isotopes $^{79}Br$ and $^{81}Br$, which are nearly equal in abundance.<br /><br />2. Analyze each option for bromine presence<br /> Check if the molecular formula contains bromine. Only $C10H16Br2$ and $C11H14Br$ contain bromine.<br /><br />3. Calculate isotopic ratio for bromine-containing formulas<br /> For $C10H16Br2$: Two bromine atoms contribute to the $M+/[M+2+]$ ratio of approximately 1/1.<br /> For $C11H14Br$: One bromine atom contributes to a different ratio, not 1/1.
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