Why para bromo benzene is major product?

The reason behind this is the steric hindrance. In the ortho product the groups are present next to each other this causes a hindrance and the group tries to attach at the para position. Hence para product predominates ortho.

Why is 4 bromophenol a major product?

The formation of 4 bromophenol occurs as the major product on reaction of the phenol with $$Br – C{S_2}$$ because it feels no steric hindrance at the para position as in carbon disulphide being the non polar compound the ionization of phenol is suppressed.

Which reagent is used to obtain p bromophenol from phenol as a major product?

When phenol reacts with Br2 in CS2 the major product obtained is.

Which of the following gives para bromination on phenol as a major product?

With Br2​−H2​O, phenol give s 2,4,6- tribromophenol but with Br−CS2​, it gives 4-bromophenol as the major product.

Why para Bromo Phenol is more stable?

Why is para bromophenol more stable than ortho bromophenol? – Quora. Para bromo phenol is more stable than ortho bromo phenol because there is less steric repulsion between the groups as there is more distance between both the groups in para.

Why para position is stable than ortho?

While in para hydrogen, the proton nuclear spins are aligned antiparallel to each other. – These two forms of molecular hydrogen are also referred to as spin isomers. – Now, due to antiparallel spin arrangement, para hydrogen has less energy and thus, they are more stable than ortho hydrogen.

Why para product is major and not Ortho?

Usually, when an ortho-para directing substituent is present for an electrophilic aromatic replacement reaction on the benzene ring, the para product is the main product except when the COOH group’s hydrogen bonding or ortho effect renders the ortho product a significant one.

Why is Ortho Nitrophenol major product?

Ortho-nitrophenol is stabilized by intramolecular Hydrogen-bonding between the H-atom of OH group and an oxygen of the nitro-group. Para-nitrophenol lacks such extra stability and hence, is relatively less stable than o-nitrophenol. Hence, the major product is o-nitrophenol.

Why phenol goes electrophilic substitution more easily than benzene?

Electron donating group increases the electron density at ortho and para position of a benzene ring and so increases the rate of electrophilic substitution reaction. As oxocation is more stable than carbocation so phenol undergoes electrophilic substitution more easily than benzene.