Homework Answers
If there is lone pair on atom bonded to ring, lone pair can be donated towards ring and hence the substituent is ortho para group.
If there is + charge on atom bonded to ring, + charge can be pull electron from ring towards itself and hence the substituent is meta group.
Answer: C
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i know that C is a meta director, but are any of these ortho
or para,...
Which of the following is an ortho-and Para-director? Which of the following is a meta-director? Which...
Which of the following is an ortho-and Para-director? Which of the following is a meta-director? Which of the following is a meta-deactivating group? Which of the following is an ortho-and para- director and a deactivator? What is(are) the product(s) when the following substance reacts with Br_2 in the presence of FeBr_3? o-bromotoluene only m-bromotoluene only p-bromololuene only an equimolar mixture of o-bromololuene and p-bromotoluene a mixture of o-bromotoluene (minor) and pbromololuene (major)
Objectives - Section 1 • Identify a substituent as an ortho para director or a meta director, Draw the resonance st...
Objectives - Section 1 • Identify a substituent as an ortho para director or a meta director, Draw the resonance structure that explains the relative directing ability of a specific substituent. Classify a substituent as an activating or a deactivating group. Explain why the halogens are ortho/para directors but are deactivators. • 1. Draw the mechanism of the reaction below and use resonance structures of the arenium ion intermediate to explain why the starting material is an ortho/para director
Classify each substituent as ortho, para activators; ortho, para deactivators; or meta deactivators. ortho, para activators...
Classify each substituent as ortho, para activators; ortho, para deactivators; or meta deactivators. ortho, para activators ortho, para deactivators meta deactivators CHO COon NH2 C(CH3)a
Are these groups activating or deactivating, ortho/para or meta directors? Table 2 EAS data and results....
Are these groups activating or deactivating, ortho/para or
meta directors?
Table 2 EAS data and results. Compound Structure of the Compound ЗаliИТА 0 ОТАРІЯ Activating Ortho/para or Deactivating Or meta director Toluene Aniline Phenyl Acetate Acetanilide Anisole OCHZ slom 2A Methyl Benzoate ctly Acetophenone Benzaldehyde Yяонт abilind Chlorobenzene (agasi. q. sb): A
I know correct answer is c. However what type of directors are A and B (meta...
I know correct answer is c. However what type of
directors are A and B (meta directors ) ??? Please explain
conceptually . Thank you!
10. Which of the following EAS reactant will give only ortho/para substitution? NH SO3H SH
15. Indicate those ortho/para director(s) and those meta director(s) - NO2 Br - -C₂Hs - NH2...
15. Indicate those ortho/para director(s) and those meta director(s) - NO2 Br - -C₂Hs - NH2 CoHs nat reagent(s), solvent(s) and chemicals are needed in making a Grignard reagent (C2HsMgBri? Choose from the following list. Water diethyl ether lithium, phenyl bromide, ethyl bromide (MR) iodine, sodium bromide, heat 17. Which one of the following reaction is a nucleophilic aromatic substitution reaction? Which one is an electrophilic aromatic substitution? HNOH,SO 18. Predict the product:
Label the following as activating (A) or deactivating (D), and then also as ortho/para directors (OP)...
Label the following as activating (A) or deactivating (D), and then also as ortho/para directors (OP) or meta directors (M). Write the answer below each group. N "Here with other ty A/D? = = = = OP/M? = f) Using resonance structures, explain why a nitro group is "meta-directing" (i.e. does the nitro group actually affect the meta positions?) g) As mentioned in class, the halogens are a bit anomalous as substituents on the aromatic ring: they are deactivating groups,...
Considering 1H-NMR analysis of substituted benzenes (for ortho, para, meta nitrobromobenzene and ortho, para dinitro bromobenzene,...
Considering 1H-NMR analysis of
substituted benzenes (for ortho, para, meta nitrobromobenzene and
ortho, para dinitro bromobenzene, or meta para dinitrobromobenzene)
: What is the splitting patterns for ring hydrogens for the
substituted benzenes? Using ??3-bond and 4-bond J coupling
constants, what are: ??Relative chemical shifts of ring
hydrogens?
Nitro group (-NO.) as a strong deactivator, is a me tivator is a meta-director in electrophilie...
Nitro group (-NO.) as a strong deactivator, is a me tivator is a meta-director in electrophilie substitution reactions. Why? A) Because it decreases electron density mostly on ortho and para positions, thus making meta positions better reactive sites, B) Because it deactivates ortho and para positions and activates the meta positions. c) Because all deactivators are meta-directors. D) Because its resonance effect competes against its inductive effect and the resonance effect increases the electron density on meta positions. E) All...
An NH2 substituent in an aromatic ring is: Select one: a. activating ortho-, meta- and para-directing...
An NH2 substituent in an aromatic ring is: Select one: a. activating ortho-, meta- and para-directing b. deactivating and ortho- and para-directing c. deactivating and meta-directing d. activating and meta-directing e. activating and ortho- and para-directing
Which of the following is an ortho-and Para-director? Which of the following is a meta-director? Which of the following is a meta-deactivating group? Which of the following is an ortho-and para- director and a deactivator? What is(are) the product(s) when the following substance reacts with Br_2 in the presence of FeBr_3? o-bromotoluene only m-bromotoluene only p-bromololuene only an equimolar mixture of o-bromololuene and p-bromotoluene a mixture of o-bromotoluene (minor) and pbromololuene (major)
Objectives - Section 1 • Identify a substituent as an ortho para director or a meta director, Draw the resonance structure that explains the relative directing ability of a specific substituent. Classify a substituent as an activating or a deactivating group. Explain why the halogens are ortho/para directors but are deactivators. • 1. Draw the mechanism of the reaction below and use resonance structures of the arenium ion intermediate to explain why the starting material is an ortho/para director
Classify each substituent as ortho, para activators; ortho, para deactivators; or meta deactivators. ortho, para activators ortho, para deactivators meta deactivators CHO COon NH2 C(CH3)a
Are these groups activating or deactivating, ortho/para or
meta directors?
Table 2 EAS data and results. Compound Structure of the Compound ЗаliИТА 0 ОТАРІЯ Activating Ortho/para or Deactivating Or meta director Toluene Aniline Phenyl Acetate Acetanilide Anisole OCHZ slom 2A Methyl Benzoate ctly Acetophenone Benzaldehyde Yяонт abilind Chlorobenzene (agasi. q. sb): A
I know correct answer is c. However what type of
directors are A and B (meta directors ) ??? Please explain
conceptually . Thank you!
10. Which of the following EAS reactant will give only ortho/para substitution? NH SO3H SH
15. Indicate those ortho/para director(s) and those meta director(s) - NO2 Br - -C₂Hs - NH2 CoHs nat reagent(s), solvent(s) and chemicals are needed in making a Grignard reagent (C2HsMgBri? Choose from the following list. Water diethyl ether lithium, phenyl bromide, ethyl bromide (MR) iodine, sodium bromide, heat 17. Which one of the following reaction is a nucleophilic aromatic substitution reaction? Which one is an electrophilic aromatic substitution? HNOH,SO 18. Predict the product:
Label the following as activating (A) or deactivating (D), and then also as ortho/para directors (OP) or meta directors (M). Write the answer below each group. N "Here with other ty A/D? = = = = OP/M? = f) Using resonance structures, explain why a nitro group is "meta-directing" (i.e. does the nitro group actually affect the meta positions?) g) As mentioned in class, the halogens are a bit anomalous as substituents on the aromatic ring: they are deactivating groups,...
Considering 1H-NMR analysis of
substituted benzenes (for ortho, para, meta nitrobromobenzene and
ortho, para dinitro bromobenzene, or meta para dinitrobromobenzene)
: What is the splitting patterns for ring hydrogens for the
substituted benzenes? Using ??3-bond and 4-bond J coupling
constants, what are: ??Relative chemical shifts of ring
hydrogens?
Nitro group (-NO.) as a strong deactivator, is a me tivator is a meta-director in electrophilie substitution reactions. Why? A) Because it decreases electron density mostly on ortho and para positions, thus making meta positions better reactive sites, B) Because it deactivates ortho and para positions and activates the meta positions. c) Because all deactivators are meta-directors. D) Because its resonance effect competes against its inductive effect and the resonance effect increases the electron density on meta positions. E) All...
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