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There are 3 possible places for the nitro group to attach: An ortho, meta, or para position. To understand the stability of the carbocation, we need to look at the resonance structures for a given attack and see what the results are.
The first resonance structure of the ortho attack results in a positive charge on the carbon with the hydroxyl group. This happens to be the most stable of the 3 resonance structures for an ortho attack because the two negative electron pairs in the oxygen act to stabilize the positive charge on the carbon. The other two resonance forms leave a carbon with a hydrogen attached, to hold the positive charge. Hydrogen can do nothing to stabilize the charge and thus, these are less stable forms.
In the para attack situation, notice that the second resonance form also puts a positive charge on the carbon with the hydroxyl group. This provides for stability just as it does in the case of an ortho attack and thus, the middle resonance form is very stable.
Finally, in the meta attack situation, all of the resonance forms result in a positive charge on a carbon with only a hydrogen attached. None of these is stable, and thus, meta attack with a hydroxyl group attached, is a very small percentage of the product.
So the electron pairs in the oxygen act to stabilize the ortho and para attacks.
What else can I help you with?
What is ortho meta and para in benzene?
ortho-para in benzene is meaningless these positions are for monosubstituted benzene. Meta is positions 3 and 5. Ortho is position 2 and 6 with relation to already attached group, para is 4 (opposite) to attached group.
Is the substituent SO3H ortho para directing?
Yes, the substituent SO3H is ortho para directing.
Although chlorine is an electron withdrawing group yet it is ortho - para directing in electrophilic aromatic substitution reactions?
In aromatic compound chlorine attached to the ring acts as the electrons donor group because the lone pair of chlorine becomes involved in process of resonance and is responsible to create the negative charge at ortho and para positions so acts as ortho-para director.
Is the director of the ortho para department an experienced professional in the field?
Yes, the director of the ortho para department is an experienced professional in the field.
Are halogens ortho para directors in organic chemistry reactions?
Yes, halogens are ortho para directors in organic chemistry reactions.
What is ortho meta and para in benzene?
ortho-para in benzene is meaningless these positions are for monosubstituted benzene. Meta is positions 3 and 5. Ortho is position 2 and 6 with relation to already attached group, para is 4 (opposite) to attached group.
Is the substituent SO3H ortho para directing?
Yes, the substituent SO3H is ortho para directing.
What is para and ortho hydrogen?
A molecule of diatomic hydrogen (hydrogen gas) contains two hydrogen atoms. The nucleus of each aton (a protron) is spinning. Depending upon the direction of the spin of the two nuclei, the hydrogens are of two types: ortho or para. Ortho-hydrogen molecules are those in which the spins of both the nuclei are in the same direction. Para-hydrogen is when the spins of both the nuclei are in the opposite directions. Ordinary hydrogen gas is an equilibrium mixture of ortho and para hydrogen. The amount of ortho- and para-hydrogen varies with temperature. At 0°K, hydrogen contains mainly para-hydrogen which is more stable. At the temperature of liquid of air, the ratio of ortho- and para-hydrogen is 1 : 1. At the room temperature, the ratio of ortho- to para-hydrogen is at its maximum of 3 : 1. Even at very high temperatures, the ratio of ortho- to para-hydrogen can never be more than 3 : 1. So, it is possible to get pure para hydrogen by cooling ordinary hydrogen gas to a very low temperature (close to 20 K) but it is never possible to get a sample of hydrogen containing more than 75% of ortho hydrogen.
Although chlorine is an electron withdrawing group yet it is ortho - para directing in electrophilic aromatic substitution reactions?
In aromatic compound chlorine attached to the ring acts as the electrons donor group because the lone pair of chlorine becomes involved in process of resonance and is responsible to create the negative charge at ortho and para positions so acts as ortho-para director.
Is the director of the ortho para department an experienced professional in the field?
Yes, the director of the ortho para department is an experienced professional in the field.
Are halogens ortho para directors in organic chemistry reactions?
Yes, halogens are ortho para directors in organic chemistry reactions.
Activating and deactivating group of Ortho para and meta director groups Explain?
Ortho, para, and meta-directing groups are electron-donating or electron-withdrawing substituents in aromatic compounds. Activating groups increase the electron density on the ring, making it more reactive towards electrophilic substitution. Deactivating groups reduce the electron density on the ring, making it less reactive. The specific positions favored for substitution (ortho, para, or meta) depend on the nature of the substituent and its effects on the ring.
Is the ortho or para isomer the major product in this reaction?
In this reaction, the ortho isomer is the major product.
What are the examples of Ortho and para directing group and mata directing group?
Electrophilic Aromatic Substitution is an example of Ortho and para directing group and meta directing group.
Why halogens that is deactivate group attack to ortho and para position?
Halogens are electron-withdrawing groups due to their high electronegativity, which reduces the electron density at the ortho and para positions of an aromatic ring. This decreased electron density makes it less favorable for electrophilic aromatic substitution reactions to occur at those positions, leading to deactivation of those positions.
Why methyl attached to benzene is ortho-para director group?
This group attached to benzene ring acts as the ortho-para directing group due to Hyperconjugation.
What is the ortho-peradirective nature?
I think you're asking about ortho-para directors. o,p directors are groups bonded to a benzene ring that direct additional groups in electrophilic aromatic substitution reactions to attach to the ortho and para positions of the benzene ring. Ortho is the position next to the group and para is the position across from the group on the benzene ring. o,p directors are electron donating groups such as methoxy groups. These groups stabilize the positive charge created in the intermediate when the electrophile adds to the ortho and para positions. o,p directors do not, however, stabilize the positive charge when the electrophile adds to the meta position and therefore only allow addition to the ortho and para positions (thus the name ortho-para director).
