問題詳情
15.The 1H nmr spectrum of acetone consists of a singlet with a chemical shift of 2.07 ppm. What was thespectrometer frequency of the instrument used if this chemical shift equaled 186Hz?
(A)60MHz
(B)90MHz
(C)100MHz
(D)120MHz
(E)Need more information to determine
(A)60MHz
(B)90MHz
(C)100MHz
(D)120MHz
(E)Need more information to determine
參考答案
無參考答案
內容推薦
- If f :(a,b)→ R has a relative extremum at c∈(a,b) , then either f′(c) 0 = or f′(c) does not exis
- ( )如（乙）圖，正五邊形 ABCDE 及正六邊形 BFGHIJ邊長皆為 2，且點 A、B、F 在同一條直線上，則∠BJC為多少度?(A) 66 ° (B)68° (C) 62° (D) 60°
- 【題組】Butter can be a solid or a liquid depending on how hot or cold it gets. What evidence in the
- 一袋子中有4個圓球，球上分別標記號碼4。已知每一個球被取到的機會相等，若自袋中任取兩次球(一次一球，取後放回)，則取出的兩球號碼是4或3的機率為何？(A)1/2(B)1/4
- Let f (x) = xsin x , then = ?(A) 1 (B) (C) (D) 2 (E)
- All the following groups are activating ortho, para directors when attached to a benzene ring EXC
- Consider the following statements concerning the effect of a trifluromethyl group-CF3, on an elec
- Did you feel surprised at the news ______ Lamigo finally won the first place this year?(A) that
- Which of the following compounds has a double bond that is conjugated with the p system of the be
- I will talk to my parents before I meet anyone _________ I've just made friends with online
內容推薦
- The number of possible dichloronitrobenzene isomers is(A)3 (B)4 (C)6 (D)8 (E)9
- The relationship between magnetic field strength and the energy difference between nuclear spin s
- 【題組】What caused the liquid eggs to turn into solid scrambled eggs?(A) The heat from the cooking
- The following problem refers to the 1H nmr spectrum of CH3CH2OCH2OCH2CH(A)12 (B)5 (C)4 (D)3 (E)
- An infrared spectrum exhibits a broad band in the 3000 to 3500cm-1region and a strong peak at 171
- 【題組】What is the main idea of this story? character 角色(A) The main character and Dad made eggs a
- Give the reagent(s) that would best accomplish the following transformation. (A) CH3COOH (B) MnO
- 如圖(十四)，將二次函數 y=31x2-999x+892的圖形畫在座標平面上，判斷方程式31x2-999x+892 =0的兩根，下列敘述何者正確？ (A)兩根相異，且均為正根(B)兩根相異，且
- 座標平面上，有一線型函數圖形過 (-3, 4) 和 (-7, 4 ) 兩點，判斷此函數圖形會過哪兩象限？(A) 第一象限和第二象限(B) 第一象限和第四象限(C) 第二象限和第三象限(D) 第
- 已知甲袋有 5 張分別標示 1 ~ 5 的號碼牌，乙袋有 6 張分別標示 6 ~ 11 的號碼牌，慧婷分別從甲、乙兩袋中各抽出一張號碼牌。若同一袋中每張號碼牌被抽出的機會相等，則她抽出兩張號碼
- The acid present in vinegar is .(A) Ethanol (B) Ethanoic acid (C) Formic acid(D) B
- The compound, 2-methy1-2-propanol, is an isomer of .(A) butane (B) propane (C) b
- What is the name of the following amine? (A) Pyridine (B) Pyrrole (C) Piperidine(D) Pyrimidine (
- 【題組】What does the word “observed” mean in the article?(A) ate(B) watched(C) caused(D) cooked
- 圖 ( 十二 ) 為正三角形 ABC 與正方形 DEFG 的重疊情形，其中 D、E 兩點分別在 上，且 。若 ，則 F 點到 的距離為何？ (A) 2(B) 3(C) 12-4√3(D) 6√
- 如圖(八),長方形ABCD中,M、N兩點分別是 的中點,且長方形AMND分成甲、乙兩長方形,長方形MBCN分成丙、丁兩長方形。若面積比甲:乙=7:3,丙:丁=5:9,則乙:丙=?(A)1 :
- (25~27)【題組】__________ is a result of losing an hour of sleep while _________ is a result of slee
- Rank the following species in order of increasing polarity of the carbon-metal bond (lest®most po
- Which (if any) of the following would not be classified as an organometallic substance?(A)Triethy
- Which of the following dissolved in water to form acid rain?(A) H2SO4 (B) HCl(g) (C) NO2(g)(D) C
- (A) (B) (C) (D) (E)
- 圖(十五)為一個四邊形 ABCD，其中 與 交於E點，且兩灰色區域的面積相等。若 = 11， = 10，則下列關係何者正確？ (A)∠DAE ＜ ∠BCE(B)∠DAE＞∠BCE(C) (D
- 【題組】Kids who sleep better might go to bed the same time each night, while kids who havesleeping
- Which structure best fits compound Y produced by the following series of reactions starting with
- 【題組】An opinion is someone’s personal idea that shows his or her thoughts. A fact is a statementt