Condensation Reactions

• Condensation reaction is the reverse of which of the following reaction? a) lock and key hypothesis b) oxidation c) hydrolysis d) glycogen formation

• Condensation reaction always results in the formation of complex sugar (disaccharide or polysaccharide) and which of the following? a) amino acids b) lipids c) water d) maltose

• In which condensation an enol or an enolate ion reacts with a carbonyl compound to form a β-hydroxyaldehyde or β-hydroxyketone (an aldol reaction), followed by dehydration to give a conjugated enone happens? a) Aldol condensation b) Claisen reduction c) Henry condensation d) Knoevenagel condensation

• Which of the following statements is wrong? a) The base-catalysed α-halogenation of propanone is first order in the concentration of the base b) The rate constant for the base-catalysed α-halogenation of propanone decreases in the order Cl2 > Br2 > I2 c) The base-catalysed α-halogenation of propanone proceeds easily to give 1,1,1-trihalopropanone d) Polyhalogenation of propanone is difficult under acidic conditions, but the products are the same as those obtained under basic conditions

• Which of the following statements is wrong? a) Hydrolysis of an acetal is catalysed by acids b) Hydrolysis of an acetal is catalysed by aqueous acid c) Oximes are stabilized by conjugation between the C=N and OH groups d) Enamines are formed between secondary amines and the carbonyl group of aldehydes and ketones

• Acetal on acid hydrolysis generates which of the following? a) Alcohol b) Amine and aldehyde c) Ketone and alcohol d) Ketone and ether

• Dimethoxymethane is dimethyl acetal of which of the following? a) Formaldehyde b) Acetaldehyde c) Tolualdehyde d) Propionaldehyde

• Which of the following is not polyacetal? a) Dimethoxymethane b) Dioxolane c) Starch d) Cellulose

• In keto-enol from presence of which type of hydrogen is must? a) Alpha b) Beta c) Gamma d) Any position of hydrogen

• Which of the following tautomeric form is more stable? CH3-CH=O ↔ CH2=C-OH (I) (II) a) I b) II c) Both are equally stable d) Both are unstable

• Hydrolysis of CH3CH2NO2 with 85% H2SO4 gives which of the following compound? a) CH3CH2OH b) C2H6 c) CH3CH=NOH d) CH3COOH

• Acetic acid is obtained when which of the given reaction takes place? a) Methyl alcohol is oxidised with potassium permanganate b) Calcium acetate is distilled in the presence of calcium formate c) Acetaldehyde is oxidised with potassium dichromate and sulphuric acid d) Glycerol is heated with sulphuric acid

• Acetic acid is manufactured by the fermentation of which of the following reaction? a) Ethanol b) Methanol c) Ethanal d) Methanal

• When benzyl alcohol is oxidised with KMnO4, the product obtained is which of the following compound? a) Benzaldehyde b) Benzoic acid c) CO2 and H2O d) Benzophenone

• Which of the following gives benzoic acid on oxidation? a) Chlorophenol b) Chlorotoluene c) Chlorobenzene d) Benzyl chloride

• Formic acid is obtained when which of the given reaction occurs? a) Calcium acetate is heated with conc. H2SO4 b) Calcium formate is heated with calcium acetate c) Glycerol is heated with oxalic acid at 110℃ d) Acetaldehyde is oxidised with K2Cr2O7 and H2SO4

• o-xylene when oxidised in presence of V2O5 the product is which carboxylic acid? a) Benzoic acid b) Phenyl acetic acid c) Phthalic acid d) Acetic acid

• By aerial oxidation, which one of the following gives phthalic acid? a) Naphthalene b) Benzene c) Mesitylene d) Toluene

• Which of the following acids has the smallest dissociation constant? a) CH3CHFCOOH b) FCH2CH2COOH c) BrCH2CH2COOH d) CH3CHBrCOOH

• The vapour of a carboxylic acid HA when passed over MnO2 at 573 K yields propanone. What is the acid HA? a) Methanoic acid b) Ethanoic acid c) Propanoic acid d) Butanoic acid

• Which acid is strongest or Which is most acidic? a) Cl2CH.COOH b) ClCH2COOH c) CH3COOH d) Cl3C.COOH

• The acid which reduces Fehling solution is which of the following? a) Methanoic acid b) Ethanoic acid c) Butanoic acid d) Propanoic acid

• Which class of compounds shows H-bonding even more than in alcohols? a) Phenols b) Carboxylic acids c) Ethers d) Aldehydes

• Which of the following is the strongest acid? a) CH3COOH b) BrCH2COOH c) ClCH2COOH d) FCH2COOH