Q11 V2The infrared spectrum of cocaine is shown below. From this spectrum it may be concluded that

Question

BlackTom AI · Accepted Answer

Start by aligning the options with what an IR spectrum can reveal about functional groups.
Option a: 'cocaine is an alcohol' would require a strong O–H stretch around 3200–3550 cm-1. The IR spectrum shown does not display a characteristic broad O–H stretch in that region, and cocaine does not contain a free hydroxyl group typical of simple alcohols. This makes the statement unlikely.
Option b: 'cocaine does not contain any C-C single bonds' is inconsistent with the molecule's framework. Cocaine has a complex ring system and many carbon–carbon single bonds; an IR spectrum cannot prove absence of C–C bonds, and the presence of multiple peaks in the fingerprint region supports abundant C–C bonds. Therefore, this claim is incorrect.
Option c: 'cocaine does not contain C-H bonds' would be impossible for an organic molecule of this size; IR spectra routinely show C–H stretching in the 2850–3000 cm-1 region. The spectrum provided indeed shows numerous features consistent with C–H vibrations, so asserting no C–H bonds is wrong.
Option d: 'cocaine does not have the -COOH functional group' is the most consistent with cocaine’s known structure. Cocaine contains ester and amide-like functionalities, but not a carboxylic acid (-COOH). In IR, a carboxylic acid would show a broad O–H around 2500–3300 cm-1 and a distinct C=O stretch around 1700 cm-1 with characteristic patterns. The absence of these carboxylate-specific features in the spectrum supports the statement that there is no -COOH group.
Putting these together, each incorrect option clashes with basic structural knowledge or expected IR behavior, while option d aligns with the actual functional groups present in cocaine and the typical IR signatures.

Q11 V2The infrared spectrum of cocaine is shown below. From this spectrum it may be concluded that

查看解析

登录即可查看完整答案

类似问题

Which functional group has a characteristic absorption in the 1630-1800 cm-1 region?

Neither N 2 N 2 nor O 2 O 2 are greenhouse gases because BlackTom题目解析

Q11 V2The infrared spectrum of cocaine is shown below. From this spectrum it may be concluded that

Which one of the following compounds (1 to 4) corresponds to the IR spectrum shown? (you can refer to a table of characteristic absorptions) Spectra reproduced with permission from NIST

Which one of the following compounds (1 to 4) corresponds to the IR spectrum shown? (you can refer to a table of characteristic absorptions) Spectra reproduced with permission from NIST

Which one of the following compounds (1 to 4) corresponds to the IR spectrum shown? (you can refer to a table of characteristic absorptions) Spectra reproduced with permission from NIST

A strong signal at 3400 cm–1 in an IR spectrum indicates the presence of what type of bond? (you can refer to a table of characteristic absorptions)

The IR spectrum of an organic compound gives us information about

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单