Your cart is empty.
Practice each question, then open the answer or worked solution.
Out of o-nitrophenol and p-nitrophenol, which is more volatile? Explain.
Due to the presence of intramolecular hydrogen bonding between the NO2 and OH group, the o-nitrophenol is more volatile.
Out of o-nitrophenol and o-cresol, which is more acidic?
There is an electron-withdrawing group NO2 that is present in the ortho position in ortho-nitrophenol, which enhances the acidic strength and makes it more acidic. In o-cresol, there is an electron-releasing group that decreases acidic strength.
When phenol is treated with bromine water, a white precipitate is obtained. Give the structure and the name of the compound formed.
The name of the compound formed in this reaction is 2,4,6-tribromophenol. The structure of the compound formed is:
Arrange the following compounds in increasing order of acidity and give a suitable explanation. Phenol, o-nitrophenol, o-cresol
Increasing order of the acidity of the given compounds: o-cresol < Phenol < o-nitrophenol.
Due to the presence of the electron-withdrawing group, NO2 o-nitrophenol becomes more acidic. The remaining has an electron-releasing group which decreases the acidic strength.
Alcohols react with active metals e.g. Na, K etc., to give corresponding alkoxides.
Write down the decreasing order of reactivity of sodium metal towards primary, secondary and tertiary alcohols
The decreasing order of reactivity of sodium metal towards alcohols: Primary alcohols > secondary alcohols > tertiary alcohols
The reactivity of sodium metal towards tertiary alcohols is lowest mainly due to two reasons. First, steric hindrance of the alkyl groups. Second, an increase in the electron density of the Oxygen atom in the hydroxyl bond.
What happens when benzene diazonium chloride is heated with water?
When benzene diazonium chloride is heated with water, Phenol is formed along with the by-products, Nitrogen gas and Hydrochloric acid.
Arrange the following compounds in decreasing order of acidity.
H2O, ROH, HC ≡ CH
The decreasing order of the acidity of the given compounds:
H2O > ROH > HC ≡ CH
HC ≡ CH is less acidic because the carbon atoms here are sp hybridised, so the electron density is higher on the carbon atom.
Name the enzymes and write the reactions involved in the preparation of ethanol from sucrose by fermentation.
The names of the enzymes involved in the preparation of ethanol from sucrose by fermentation are invertase and zymase.
Invertase converts sucrose into glucose and fructose. Then, glucose and fructose undergo fermentation in the presence of zymase, and ethanol is produced.
How can propane-2-one be converted into tert- butyl alcohol?
Propane-2-one is treated with CH3MgBr in the presence of dry ether (Grignard reagent), followed by hydrolysis to yield tert- butyl alcohol.
Write the structures of the isomers of alcohols with molecular formula C4H10O. Which of these exhibits optical activity?
Here, only Butan-2-ol exhibits optical activity because it has a chiral carbon atom.