First Exam Key

First Exam Key - Score - Problem I I. Circle the correct...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
I. Circle the correct answer to each of the following questions (5 pts each). 1. What is the chemical shift of a proton that resonates at a 2500 Hz higher frequency than tetramethylsilane on a 500 MHz NMR spectrometer? 1 ppm 3 ppm 5 ppm 7 ppm 9 ppm 2. Which of the following hydrogen atom(s) will show the largest chemical shift (ppm)? 3. Which of the following groups of hydrogen atoms are not magnetically equivalent for an NMR spectrum obtained at room temperature? 4. How many sets of magnetically distinct sets of protons will be observed for the 1 H NMR spectrum of the following molecule (a) two (b) three (c) four (d) five (e) six H C H H H H C Cl H H H C Cl H Cl Cl C Cl H Cl H C H F H CH 2 CH 2 CH 2 Br C H H H OCH 2 CH 2 Br C H H H H H CH 3 H H H H CH 2 Cl CH 3 H H H Br CH 2 Cl Score - Problem I CH 3 H H H H CH 3 1 2 3 4 5
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 (5) What is used to separate the ions formed in a mass spectrometer? A photomultiplier tube A magnet A radio transmitter An electron beam An ion detector (6) What is the most probable structure of an ion of mass/charge = 55 observed in fragmentation of a simple alkene? (7) The frequency of the stretching vibration of a bond depends primarily upon what two properties of the bond? The length of the bond and the Pauling electronegativity of the atoms in the bond. The electronegativity of the atoms in the bond and their nuclear charge. XXX The strength of the bond and the masses of the atoms in the bond. The masses of the atoms in the bond and their atomic radii. The masses of the atoms in the bond and the number of electrons in their
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

First Exam Key - Score - Problem I I. Circle the correct...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online