How will you obtain p -hydroxybenzaldehyde from phenol’? Give chemical equation.

Phenol reacts with the mixture of hydrogen cyanide and hydrogen chloride in the presence of ZnCl 2 catalyst, forming aldimine as an intermediate that forms p -hydroxybenzaldehyde.

The mixture of alcohol and ether, used in place of petrol, is known as?

Natalite is the mixture of alcohol and ether which is used as a fuel in place of petrol. Basically, it is a mixture of ethanol and diethyl ether.

Write chemical equation of phenol with chloroform and KOH .

On treating phenol with chloroform in the presence of potassium hydroxide, a - CHO group is introduced at ortho position of benzene ring. In the above reaction, O -hydroxybenzaldehyde or salicylaldehyde form as product. This reaction is called Reimer-Tiemann reaction.

Give the name of Enzyme used to convert glucose into ethanol.

Zymase is an enzyme that is used to convert glucose into ethanol. Zymase is obtained from a living microorganism called yeast.

Write the mechanism of dehydration of ethanol to form ethene.

The mechanism of dehydration of ethanol to form ethene involves three steps: Step- I : Protonation of ethanol to form ethyl oxonium ion: Step- 2 : Formation of carbocation (rate determining step): Carbocation is the intermediate formed in the reaction. Hence, carbocation rearrangement is possible during the reaction. Step- 3 : Elimination of a proton to form ethene: The acid consumed in the first step is released in third step. After the formation of ethene, it is removed to shift the equilibrium in a forward direction.

What happens when vapour of diethyl ether is passed over alumina at 653 K temperature? Give chemical reaction.

When vapour of diethyl ether is passed over alumina at 653 K , an alkene is formed by the dehydration of diethyl ether. The chemical reaction is the following: C 2 H 5 - O - C 2 H 5 Diethyl ether → - H 2 O Al 2 O 3 , 653 K 2 CH 2 = CH 2 Ethene

Write the structural formula of tert-butyl alcohol.

When a hydrogen atom is replaced by an alcohol group in the tert-butane so tert-butyl alcohol is formed. In the tert-butyl alcohol, the alcohol group is attached to that carbon which is also attached to three other carbon atoms. It means the alcohol group attaches to a tertiary carbon.

Complete the following reaction sequence and write the name of the product A and B . C 6 H 5 - OH + CCl 4 + 4 KOH → A → H + CH 3 CO 2 O B

When phenol is treated with carbon tetrachloride in the presence of potassium hydroxide, salicylic acid is formed. Salicylic acid reacts with acetic anhydride in the presence of an acid to form aspirin (2-acetoxy benzoic acid). Thus, the product A is salicylic acid and product B is aspirin.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter -1 - Alcohols, Phenols and Ethers>Rajasthan Board-2018>Q 4

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12th Rajasthan Board

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How to convert methanol into ethanol? Write chemical equations only.

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