Which of protons, 1 to 4, in the following molecule gives a triplet signal in a 1H NMR spectrum?单项选择题

题目图片
A

a. 1

B

b. 2

C

c. 3

D

d. 4

登录即可查看完整答案

我们收录了全球超50000道真实原题与详细解析,现在登录,立即获得答案。

类似问题

Question textQ17 V1(5 marks) a) For the following compound, predict the splitting pattern found for the letters, a, b, c and d. (i) Splitting pattern for a is Answer 1 Question 17[select: , singlet, triplet, doublet, quartet] (1 mark) (ii) Splitting pattern for b is Answer 2 Question 17[select: , quartet, singlet, triplet, doublet] (1 mark) (iii) Splitting pattern for c is Answer 3 Question 17[select: , quartet, triplet, singlet, doublet] (1 mark) (iv) Splitting pattern for d is Answer 4 Question 17[select: , doublet, quartet, singlet, triplet] (1 mark) b) For the compound shown above, molecular ion peaks on a mass spectrum would be seen closest to m/z ratio(s) of Answer 5 Question 17[select: , 169 and 170, 168.9 and 170.9, 168 and 169, 168 and 170] (1 mark)

Choose a, b, c or d as the best answer. 2. Which statement about Brutalist buildings would the author, most probably, agree with?

Section A: Read the text and answer the questions. Brutalism is an architectural style, introduced in the 1950s. It uses exposed concrete to create geometric structures with a grey appearance. Concrete buildings are often criticised as cold and ugly, lacking the warmth of stone or the smooth feel of steel. However, concrete, as a building material, has unique characteristics. It is extremely flexible when wet, and is adapted to create interesting shapes. Many urban public buildings, such as universities, have also used concrete as the main material to indicate strength and permanence. Instead of keeping Brutalist buildings, many are being demolished to make space for modern styles. However, this does not acknowledge the cultural history of these buildings, and is not sustainable. Fill in the gap with ONE WORD from the paragraph. 1. Brutalist architecture included exposed concrete, which gave a cold Answer Question 1[input] .

Question 30 Choose a, b, c or d as the best answer. The author’s main argument is that the 100:80:100 model __________.

更多留学生实用工具

加入我们，立即解锁 海量真题 与 独家解析，让复习快人一步！