The reason as to why the addition of HBr to alkenes A and C forms the addition products B and D is to be stated. Concept introduction: According to Markovinokov’s rule, the positive part of halogen acid attached to that carbon atom in C=C bond which carries maximum number of hydrogen atoms and the negative part of halogen acid will attach to that carbon atom in C=C bond which has minimum number of hydrogen atoms. The steps followed by electrophilic addition reaction are stated below: • First protonation of the alkene take place to generate the carbocation. • The halide ion will attack on the carbocation to give the final product.

Question

NMR spectrum of ethyl acetate has signals whose chemical shifts are indicated below. Which hydrogen or set of hydrogens corresponds to the signal at 4.1 ppm? Select the single best answer. The H O HỌC—C—0—CH, CH, 2 A ethyl acetate H NMR: 1.3 ppm, 2.0 ppm, 4.1 ppm Check OA B OC ch B C Save For Later Submit Ass © 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center |

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Chapter 10, Problem 61P

Interpretation Introduction

Interpretation: The reason as to why the addition of HBr to alkenes A and C forms the addition products B and D is to be stated.

Concept introduction: According to Markovinokov’s rule, the positive part of halogen acid attached to that carbon atom in C=C bond which carries maximum number of hydrogen atoms and the negative part of halogen acid will attach to that carbon atom in C=C bond which has minimum number of hydrogen atoms.

The steps followed by electrophilic addition reaction are stated below:

• First protonation of the alkene take place to generate the carbocation.

• The halide ion will attack on the carbocation to give the final product.

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NMR spectrum of ethyl acetate has signals whose chemical shifts are indicated below. Which hydrogen or set of hydrogens corresponds to the signal at 4.1 ppm? Select the single best answer. The H O HỌC—C—0—CH, CH, 2 A ethyl acetate H NMR: 1.3 ppm, 2.0 ppm, 4.1 ppm Check OA B OC ch B C Save For Later Submit Ass © 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center |

How many signals do you expect in the H NMR spectrum for this molecule? Br Br Write the answer below. Also, in each of the drawing areas below is a copy of the molecule, with Hs shown. In each copy, one of the H atoms is colored red. Highlight in red all other H atoms that would contribute to the same signal as the H already highlighted red Note for advanced students: In this question, any multiplet is counted as one signal. 1 Number of signals in the 'H NMR spectrum. For the molecule in the top drawing area, highlight in red any other H atoms that will contribute to the same signal as the H atom already highlighted red. If no other H atoms will contribute, check the box at right. Check For the molecule in the bottom drawing area, highlight in red any other H atoms that will contribute to the same signal as the H atom already highlighted red. If no other H atoms will contribute, check the box at right. O ✓ No additional Hs to color in top molecule ง No additional Hs to color in bottom…

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