Question

what is Jones reagent and explain why Ortho nitrophenol is more acidic than Ortho methoxyphenol ​

Answer 1

The Jones Reagent is a solution of chromium trioxide in diluted sulfuric acid that can be used safely for oxidations of organic substrates in acetone. The reagent can also be prepared from sodium dichromate and potassium dichromate. Jones Reagent is especially suitable for the oxidation of secondary alcohols to ketones and of primary alcohols to carboxylic acids and in a few cases to aldehydes (Jones Oxidation). Some alternative chromium reagents allow the selective preparation of aldehydes, such as PCC and PDC.

The nitro-group is an electron-withdrawing group. The presence of this group in the ortho position decreases the electron density in the O-H bond. As a result, it is easier to lose a proton. Also, the o-nitrophenoxide ion formed after the loss of protons is stabilized by resonance. Hence, ortho nitrophenol is a stronger acid.

On the other hand, methoxy group is an electron-releasing group. Thus, it increases the electron density in the O-H bond and hence, the proton cannot be given out easily.

For this reason, ortho-nitrophenol is more acidic than ortho-methoxyphenol.

Answer 2

Hey mate here is your answer★★★★★:—

The presence of this group in the ortho position in ortho nitro phenol decreases the electron density in the O−H bond. As a result, it is easier to lose a proton. Also, the o-nitrophenoxide ion formed after the loss of protons is stabilized by resonance. Hence, ortho nitrophenol is a stronger acid


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