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Mere Teacher · Previous Year Questions
NEET Chemistry · Aldehydes & Ketones · Set 9 (Q241-264)
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241.
L-isomer of a compound 'A' (C4H8O4) gives a positive test with [Ag(NH3)2]+. Treatment of 'A' with acetic anhydride yield triacetate derivative. Compound 'A' produces an optically active compound (b) and an optically inactive compound (c) on treatment with bromine water and HNO3 respectively, compound (a) is:
(1)
(2)
(3)
(4)
242.
Identify the compound ' D ' in above mentioned series of reactions.
(1)
(2)
(3)
(4)
243.
The major products P and Q in the following reaction sequences are
P Q
(1)3-methylpentanol Ethanol
(2)3-methylpentanal Ethanal
(3)3-methylbutanol Ethanol
(4)3-methylbutanal Ethanal
244.
Which of the following is an example of conjugated diketone?
(1)CH3−C(=O)−CH2−CH2−CH2−C(=O)−CH3
(2)
(3)
(4)
245.
Isobutyraldehyde on reaction with formaldehyde and K2CO3 gives compound ‘A’ Compound 'A' reacts with KCN and yields compound 'B' which on hydrolysis gives a stable compound 'C'. The compound 'C' is
(1)HO−CH2−C(CH3)(CH3OH)−CH(OH)−COOH
(2)HO−CH2CH2−CH(CH3)−CH(OH)−COOH
(3)
(4)
246.
In the following reactions, products A and B are: HdilNaOH(A) (A)H3O+(B)
(1)
(2)
(3)
(4)
247.
The structures of major products A, B and C in the following reaction are sequence.
(1)
(2)
(3)
(4)
248.
Which of the following compound can give positive iodoform test when treated with aqueous KOH solution followed by potassium hypoiodite.
(1)CH3CH2−C(Cl)2−CH3
(2)
(3)CH3CH2−C(=O)−CH2CH3
(4)CH3CH2CH2CHO
249.
The major product of the following reaction is :
(1)CH3−CH(CH3)−CH(Br)−CH2OH
(2)CH3−CH(CH3)−CH2−CH2−CH2OH
(3)CH3−CH(CH3)−CH2−CH2OH
(4)CH3−CH(CH3)−CH2−CH2−Cl
250.
The correct set of reagents which convert acetylene to but-2-enal are
(1)H2SO4,NaOH
(2)H2O/Hg2+/H+, dil. NaOH
(3)H2O/H+, conc. NaOH
(4)H2O,KMnO4/OH−
251.
The major product of the following reactions
(1)CH3CH2CHBrCO2H
(2)CH3CH2CH2CH2CHBrCO2H
(3)CH3CH2CH2CHBrCO2H
(4)CH3CH2CH2CHBrCOBr
252.
The major product formed in following reaction is: dil.NaOH
(1)
(2)
(3)
(4)
253.
Identify the major product (P) in the given reaction. CH3CH2CHO(i) Dil. NaOH(ii) Δ(P) In the above reaction P is
(1)H3C−CH2−CH=CH−CH2−CHO
(2)H3C−CH2−CH(OH)−CH2−CH2−CHO
(3)CH3−CH(CH3)−CH=CH−CHO
(4)CH3−CH2−CH=C(CH3)−CHO
254.
Complete the following reaction. HCNConc.H2SO4Δ [C] is…. . [NEET 2023]
(1)
(2)
(3)
(4)
255.
The major product of the following reaction is: NaBH4MeOH,25°C
(1)
(2)
(3)
(4)
256.
Tischenko reaction is a modification of
(1)Aldol condensation
(2)Claisen condensation
(3)Cannizzaro reaction
(4)Pinacol-pinacolone reaction
257.
Formalin is an aqueous solution of
(1)fluorescein
(2)formic acid
(3)formaldehyde
(4)furfuraldehyde
258.
The number of the correct reaction(s) among the following is______
(1)
(2)
(3)
(4)
259.
Identify X,Y and Z. H3CCH2CO2HP2O5ΔXH2OYSOCl2Z X Y Z
(1)H2C=CHCO2HHOH2CCHOHCO2HHOH2CCHOHCOCl
(2)(H3CCH2CO)2OH3CCH2CO2HH3CCH2COCl
(3)(H3CCO)2OH3CCO2HClCH2COCl
(4)(H3CCH2CO)2OH3CCO2HH3CCOCl
260.
Sodium formate on heating yields
(1)oxalic acid and H2
(2)sodium oxalate and H2
(3)CO2 and NaOH
(4)sodium oxalate.
261.
Identify the name reaction.
(1)Stephen reaction
(2)Etard reaction
(3)Gatterman-koch reaction
(4)Rosenmund reduction
262.
In the reaction, CH3CN+2HHClEtherXBoiliing H2OY; the term Y is
(1)acetaldehyde
(2)ethanamine
(3)acetone
(4)dimethylamine.
263.
An organic compound (X) with molecular formula C3H6O is not readily oxidised. On reduction it gives C3H8O(Y) which reacts with HBr to give a bromide (Z) which is converted to Grignard reagent. This Grignard reagent on reaction with (X) followed by hydrolysis give 2,3-dimethylbutan-2-ol. Compounds (X),(Y) and (Z) respectively are:
