Fischer's Esterification Process
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Q.
An organic compound (A) (molecular formula (C8H16O2) was hydrolysed with dilute sulphuric acid to give a carboxylic acid (B) and alcohol (C). Oxidation of (C) with chromic acid produced (B). (C) on dehydration gives but - 1 - ene. Write equations for the reactions involved.
Q.
Give plausible explanation for each of the following:
Cyclohexanone forms cyanohydrin in good yield but 2, 2, 6-trimethyl cyclohexanone does not.
These are two −NH2 groups in semicarbazide. However, only one is involved in the formation of semicarbazones.
During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst, the water or the ester should be removed as soon as it is formed.
Q. What represents the best method for converting a carboxylic acid to an aldehyde?
- Reduce the acid with LiAlH4.
Convert the acid to an acid chloride, and react the acid chloride with water.
- Convert the acid to an acid chloride, and reduce the acid chloride with lithium aluminium tri(t-butoxy) hydride.
- Convert the acid to an acid chloride, react the acid chloride with a Grignard reagent, and reduce the product with LiAlH4.
Q. Which of the following is not a correct statement for primary aliphatic amines?
- Primary amines are less basic than the secondary amines.
- Primary amines on treating with nitrous acid solution form corresponding alcohols except methyl amine.
- Primary amines can be prepared by the Gabriel phthalimide synthesis.
- The intermolecular association in primary amines is less than the intermolecular association in secondary amines
Q. 41.When CH3COCH3 reacts NH2OH, it gives the product X and X on reacting LiAlH4 gives product Y. Find X & Y
Q. 34. Which is the predominant product formed on reaction of CH3CH2CH2Cl with Mg in the presence of dry ether: A) CH3CH2CH2MgCl OR B) (CH3)2CHMgCl
Q. Aspirin is produced from the reaction between salicylic acid and which compound?
- Acetyl chloride
- Acetic anhydride
- Phenyl acetate
- Benzoyl chloride
Q. Which alkylbromide will yield 3-Methyl-1-hexene as the major product upon treatment with potassium t-butoxide in t-butyl alcohol (solvent)?
Q. Propene, CH3−CH=CH2, can be converted to 1-propanol by oxidation. Which set of reagents among the following is deal to effect the conversion?
- Alkaline KMnO4
- BH3, THF/NaOH, H2O2
- O3/Zn dust
- OsO4/NaHSO3, H2O
Q. 34. Chlorobenzene reacts with sodamide in the presence of liquid ammonia whereas 2-bromo-3-methyl anisole fails to react. Give reason
Q. Reduction of carboxylic acids gives
- Alcohol with hydrogen in presence of palladium
- Alcohol with LiAlH4
- Aldehyde with LiAlH4
- All of the above
Q. Which one of the following compound gives aspirin on reacting with acetic anhydride in presence of H2SO4
Q. Which reagent can be used to convert ethanol to diethylether?
- Al2O3 at 250∘C
- conc. H2SO4 at 170∘C
- conc. H2SO4 at 140∘C
- Al2O3 at 350∘C
Q. The products P and Q in the following reactions are:
- P is an aldehyde whereas Q is a carboxylic acid.
- P is a carboxylic acid whereas Q is a ketone.
- P is and Q both are aldehydes.
- P is and Q both are carboxylic acids.
Q. The correct options for the products \(A~and~B\) of the following reactions are :
\( A +\frac{ Br \text { (entess) }}{ H _{2} O } \) \( \frac{ Br _{2}}{ CS _{2}, 5^{\circ} C }= B \)
\( A +\frac{ Br \text { (entess) }}{ H _{2} O } \) \( \frac{ Br _{2}}{ CS _{2}, 5^{\circ} C }= B \)
Q. Which of the following cannot be a catalyst in the electrophilic substitution of arenes?
- FeCl3
- AlCl3
- NH3
- FeBr3
Q. Aspirin is known as:
- Phenyl salicylate
- Methyl salicylic acid
- Acetyl salicylate
- Acetyl salicylic acid
Q. in which of the follwoing dipole moment is largest
1.CH2Cl2
2.CHCl3
3.CCl4
4.CO2
Q. 
How many reactions are correct?
How many reactions are correct?
Q. A white waxy solid A on reduction gives B, having rotten fish smell. B on halogenation gives C which on hydrolysis gives an acidic compound D . if A on heating under inert atmosphere gives E, which is allotrope of A. Find A, B, C, D. Also give the chemical reaction involved.
Q. Ch3-o-c(ch3)3 + HI (1 eq)
Q. Identify the product obtained in the following reactionCH3CH2-CO-CH2CH2CH3 + acidified KMnO4 heat give products(1)CH3COOH (2)CH3CH2CH2COOH(3)CH3CH2COOH(4) all of thes
Q. Which of the following reaction will readily undergo SN2 reaction?
- CH3−CH2−OH+HI⟶CH3−CH2−I+H2O
- CH3−(CH3)CH−OH+HI⟶CH3−(CH3)CH−I+H2O
- CH3−(CH3)2C−OH+HI⟶CH3−(CH3)2C−I+H2O
- All of the above
Q. Which ester given below can most easily be produced by acid catalysed esterification (Fischer's esterification)?
- CH3CH2COOCH(CH3)CH2CH3
- CH3CH2COOC(CH3)2CH2CH3
- CH3CH2COOC2H5
- CH3CH2COOC6H5
Q. CH3COCH2CH2CH2CHO Reaction in dilute oh- medium what will be the product?
Q. Predict the products of the following reaction:
CH3−CH2−CH2−O−CH3+HBr→
CH3−CH2−CH2−O−CH3+HBr→
- Bromopropane and methanol
- Bromomethane and propanol
- Ethanol and bromoethane
- None
Q. 8. Main product formed when 1mole of CH3MgI reacts with 1mole of CH3COCH2CH2OH
Q. Give chemical test to distinguish :
(i) Formaldehyde and acetaldehyde
(ii) Dimethyl ether and ethyl alcohol
(i) Formaldehyde and acetaldehyde
(ii) Dimethyl ether and ethyl alcohol
Q. Is the reagent MnO2/CH2Cl2 capable of converting 2° alcohol to ketone ? If no , why?
Q. Identify the intermediate formed in Grignard reagent reaction with ester?
- Aldehyde
- Ketone
- Benzene
- Propene
