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Mere Teacher · Previous Year Questions
NEET Chemistry · Aldehydes & Ketones · Set 7 (Q181-210)
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181.
The major product obtained in following reaction is:
(1)
(2)
(3)
(4)
182.
The product formed by the reaction of an aldehyde with a primary amine is [NEET 2016]
(1)ketone
(2)carboxylic acid
(3)aromatic acid
(4)Schiff's base
183.
The major product of the following reaction is : (ii)DIBAL−H(i)Ni/H2
(1)
(2)
(3)
(4)
184.
Suitable reagents X and Y, respectively, in the following reactions are
(1)aq. KOH,CrO3
(2)alc. KOH,Cu/Δ
(3)aq. NaHCO3,KMnO4
(4)alc. KOH,NaOI
185.
The structure of A in the given reaction is:
(1)
(2)R−C(OH)(CH3)−CH2CH3
(3)
(4)
186.
The correct sequence of reagents for the following conversion will be :
(1)CH3MgBr, H+/CH3OH, [Ag(NH3)2]+OH–
(2)CH3MgBr, [Ag(NH3)2]+OH–, H+/CH3OH
(3)[Ag(NH3)2]+OH–, CH3MgBr, H+/CH3OH
(4)[Ag(NH3)2]+OH− , H+/CH3OH, CH3MgBr
187.
Identify the major product formed in the following reaction sequence
(1)
(2)
(3)
(4)
188.
In the presence of peroxide, styrene reacts with HBr to give X. When X reacted with magnesium in dry ether followed by CO2 and hydrolysis gave Y. Treatment of Y with PCl5 and then next with H2,Pd−BaSO4 gave Z. What is Z ?
(1)
(2)
(3)
(4)
189.
The semicarbazone of cyclobutanone is represented as
(1)
(2)
(3)
(4)
190.
Mixed aldol products obtained from aldol condensation of ethanal and propanone are
(1)
(2)
(3)
(4)
191.
Find out the major products from the following reaction sequence.
(1)
(2)
(3)
(4)
192.
The major product formed in the following reaction sequence is
(1)3-Hexanone
(2)2-Hexanone
(3)2-Methyl-3-pentanone
(4)Hexanal
193.
Aldol condensation is a popular and classical method to prepare α,β-unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is not a product of intramolecular aldol condensation?
(1)
(2)
(3)
(4)
194.
Consider the above reaction, the product ’X’ and’Y’ respectively are:
(1)
(2)
(3)
(4)
195.
Which one of the following reactions does not represent correct combination of substrate and product under the given conditions ?
(1)
(2)
(3)
(4)
196.
Identify the compound ' A ' in the following sequence of reactions. AC2H5MgBrDry etherBH3O+3-Methylpentan-3-ol
(1)Propanal
(2)Propanone
(3)Butanal
(4)Butanone
197.
Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?
(1)
(2)
(3)
(4)
198.
The intermediate compound X in the following chemical reaction is [NEET 2021]
(1)
(2)
(3)
(4)
199.
Identify A in the following chemical reaction.
(1)
(2)
(3)
(4)
200.
A compound of molecular formula C8H8O2 reacts with acetophenone to form a single cross-aldol product in the presence of base. The same compound on reaction with conc. NaOH forms benzyl alcohol as one of the products. The structure of the compound is :
(1)
(2)
(3)
(4)
201.
What is ' X ' in the following reaction?
(1)
(2)
(3)
(4)
202.
"P" is an optically active compound with molecular formula C6H12O. When 'P' is treated with 2, 4-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tollens reagent, "P" gives a negative test. Predict the structure of "P".
(1)H−C(=O)−CH2−CH(CH2−CH3)−CH3
(2)CH3−C(=O)−CH(CH2−CH3)−CH3
(3)CH3−C(=O)−CH2−CH2−CH2−CH3
(4)CH3−C(=O)−CH2−CH(CH3)−CH3
203.
Aman has been asked to synthesise the molecule (x).He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He thought of performing ozonolysis reaction on alkene to produce a dicarbonyl compound followed by aldol reaction to prepare "x". Predict the suitable alkene that can lead to the formation of "x".
(1)
(2)
(3)
(4)
204.
An acyl halide is formed when PCl5 reacts with an
(1)amide
(2)ester
(3)acid
(4)alcohol
205.
A,B,C,D in the following reactions are
(1)
(2)
(3)
(4)
206.
The major product (P) in the following reaction is :
(1)
(2)
(3)
(4)
207.
Consider the given reaction, Identify 'X' and 'Y' :
(1)
(2)
(3)
(4)
208.
The correct structure of product 'A' formed in the following reaction.
(Ph is –C6H5)
(1)
(2)
(3)
(4)
209.
A primary alcohol was reacted with pyridinium chlorochromate (PCC), which resulted in a product P. The product P on treatment with ammonical silver nitrate solution produces.
(1)Anhydride of carboxylic acid
(2)Aldehyde
(3)Amide
(4)Carboxylate anion
210.
Identify the product ' B ' in the following reaction. Toluene →ChromylchlorideCS2A→H3O+B
