Chapter 28

Aldehydes and ketones are distinguished by using (a) Tollen's reagent (b) Lucas reagent (c) Borshe reagent (d) all of these

Carbonyl compounds undergo nucleophillic addition because of (a) more stable anion with negative charge on oxygen and less stable carbocation (b) electromeric effect (c) electronegativity difference of carbon and oxygen atoms (d) none of these

Clemmensen reduction is carried with (a) LiAlH \(_{4}\) in ether (b) \(\mathrm{Zn}-\mathrm{Hg}\) and \(\mathrm{HCl}\) (c) \(\mathrm{H}_{2}\) in the presence of \(\mathrm{Pd}\) (d) \(\mathrm{NH}_{2} \mathrm{NH}_{2} /\) glycol and \(\mathrm{KOH}\)

The addition of HCN to carbonyl compounds is an example of (a) electrophillic addition (b) nucleophillic addition (c) nucleophillic substitution (d) electrophilic substitution

Cyanohydrin of which of the following will yield lactic acid? (a) HCHO (b) \(\mathrm{CH}_{3} \mathrm{COCH}_{3}\) (c) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHO}\) (d) \(\mathrm{CH}_{3} \mathrm{CHO}\)

If formaldehyde and \(\mathrm{KOH}\) are heated, then we get (a) methyl alcohol (b) acetylene (c) methane (d) ethyl formate

Which of the following will not give iodoform test? (a) ethanol (b) ethanal (c) pentan-3-one (d) pentan-2-one

Oxidation of toluene to benzaldehyde by the use of chromyl chloride is called (a) Wurtz reaction (b) Fittig reaction (c) Etard's reaction (d) Rosenmund's reaction

Which aldehyde will give Cannizzaro's reaction? (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CHO}\) (b) CCC(C=O)C=O (c) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCHO}\) (d) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCH}_{2} \mathrm{CHO}\)

Rearrangement of an oxime to an amide in presence of strong acid is called (a) Beckmann rearrangement (b) Fries rearrangement (c) Sandmeyer reaction (d) Curtius rearrangement

Concentrated sodium hydroxide and benzaldehyde react to produce (a) cinnamic acid (b) hydrobenzamide (c) benzyl alcohol (d) benzophenone

Concentrated sodium hydroxide and benzaldehyde react to produce (a) cinnamic acid (b) hydrobenzamide (c) benzyl alcohol (d) benzophenone

Fomaldehyde when reacted with methyl magnesium bromide followed by hydrolysis gives (a) HCHO (b) \(\mathrm{CH}_{3} \mathrm{COOH}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) (d) \(\mathrm{CH}_{3} \mathrm{CHO}\)

In which reaction aromatic aldehyde is treated with acid anhydride in presence of corresponding salt of the acid to give unsaturated acid? (a) Perkin's reaction (b) Friedal-Craft reaction (c) Wurtz reaction (d) None of these

Formaldehyde \(+\mathrm{NH}_{3} \longrightarrow \mathrm{Y} .\) The product \(\mathrm{Y}\) is (a) hexamethylene tetramine (b) formamide (c) paraformaldehyde (d) methanol

Dimerisation is carboxylic acids is due to (a) intermolecular hydrogen bond (b) coordinate bond (c) ionic bond (d) covalent bond

Carboxylic acids are more acidic than phenol and alcohol because of (a) formation of dimers (b) highly acidic hydrogen (c) resonance stabilization of their conjugate base (d) intermolecular hydrogen bonding

Which of the following gives aldol condensation reaction? (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{CO}-\mathrm{CH}_{3}\) (b) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{CO}-\mathrm{CH}_{3}\) (c) \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CO}-\mathrm{C}_{6} \mathrm{H}_{5}\) (d) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}\)

Acetaldehyde cannot exhibit (a) Iodoform test (b) Benedict's test (c) Lucas test (d) Tollen's test

Ketones \(\left(\mathrm{R}_{1} \mathrm{COR}_{2}\right) ; \mathrm{R}_{1}=\mathrm{R}_{2}=\) alkyl group, can be obtained in one step by (a) hydrolysis of esters (b) oxidation of primary alcohols (c) oxidation of secondary alcohols (c) reaction of acid halides and alcohlos

Which compound does not give cannizzaro's reaction? (a) trichloro acetaldehyde (b) benzaldehyde (c) formaldehyde (d) acetaldehyde

On reacting with grignard reagent acetone gives (a) \(1^{\circ}\) alcohol (b) \(2^{\circ}\) alcohol (c) \(3^{\circ}\) alcohol (d) none of these

When aliphatic aldehyde heat with Fehling solution product formed is (a) \(\mathrm{CuO}\) (b) \(\mathrm{Cu}_{2} \mathrm{O}\) (c) \(\mathrm{CuSO}_{4}\) (d) \(\mathrm{Cu}\)

Which of the following reagents is used to distinguish acetone and acetophenone? (a) \(\mathrm{NH}_{4} \mathrm{Cl}\) (b) \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) (c) \(\mathrm{NaHSO}_{3}\) (d) Grignard reagent.

Conversion of benzaldehyde of 3 -phenylprop-2energy-1-oic acid is (a) aldol condensation (b) claisen condensation (c) oxidative reaction (d) perkin condensation

Which of the following reacts with both acetaldehyde and acetone? (a) Fehling's solution (b) \(\mathrm{CH}_{3} \mathrm{MgBr}\) (c) Tollen's reagent (d) Benedict solution

Schiff's solution \(\mathrm{B}\) is obtained when (a) sulphurous acid is passed through magenta dye (b) chlorine is passed through magenta dye (c) both (a) and (b) (d) none of the above

Which of the following is oxidized to the corresponding carbonyl compound? (a) o-nitrophenol (b) 2 -hydroxypropane (c) 2 -methyl-2-hydroxypropane (d) phenol

When ethanal is heated with Fehling's solution it gives a precipitate of (a) \(\mathrm{CuO}\) (b) \(\mathrm{Cu}\) (c) \(\mathrm{Cu}+\mathrm{Cu}_{2} \mathrm{O}+\mathrm{CuO}\) (d) \(\mathrm{Cu}_{2} \mathrm{O}\)

Monomer of trioxane is (a) formaldehyde (b) acetone (c) isoprene (d) acetaldehyde

Which will not give formaldehyde on heating or upon distillation? (a) paraldehyde (b) trioxane (c) formalin (d) paraformalehyde

In the reaction, \(\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{HCN} \longrightarrow \mathrm{X}\), a chiral centre is introduced. The product \(X\) is (a) laevo rotatory (b) dextro rotatory (c) meso compound (d) racemic mixture

Which of the following react with \(\mathrm{NaOH}\) to produce an acid and an alcohol? (a) \(\mathrm{CH}_{3} \mathrm{COOH}\) (b) HCHO (c) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}\) (d) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH}\)

Formaldehyde on condensation in presence of \(\mathrm{Ca}(\mathrm{OH})_{2}\) gives (a) formose (b) fructose (c) maltose (d) xylose

Which one of the following responds to Tollen's test? (a) \(\mathrm{CH}_{3} \mathrm{COCH}_{3}\) (b) \(\mathrm{CH}_{3} \mathrm{CHO}\) (c) \(\mathrm{CH}_{3} \mathrm{COOH}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{OC}_{2} \mathrm{H}_{5}\)

\(\mathrm{CH}_{3} \mathrm{CHCl}_{2}\), on hydrolysis will give (a) \(\mathrm{CH}_{3} \mathrm{CHO}\) (b) \(\mathrm{CH}_{3} \mathrm{COOH}\) (c) \(\mathrm{CHCl}_{3}\) (d) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\)

The reagent used for the separation of acetaldehyde from acetophenone is (a) \(\mathrm{NH}_{2} \mathrm{OH}\) (b) \(\mathrm{NaHSO}_{3}\) (c) \(\mathrm{NaOH} / \mathrm{I}_{2}\) (d) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NHNH}_{2}\)

Acetaldehyde gives orange coloured precipitate on treatment with (a) \(2,4-\mathrm{DNP}\) (b) \(\mathrm{NH}_{2} \mathrm{OH}\) (c) \(\mathrm{NaHSO}_{3}\) (d) \(\mathrm{NaOH}\)

Which of the following reagents converts \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COCHO}\) to \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}(\mathrm{OH}) \mathrm{COOH} ?\) (a) aq. \(\mathrm{NaOH}\) (b) Acidic \(\mathrm{Na}_{2} \mathrm{SO}_{3}\) (c) \(\mathrm{Na}_{2} \mathrm{CrO}_{4} / \mathrm{H}_{2} \mathrm{SO}_{4}\) (d) \(\mathrm{NaNO}_{2} / \mathrm{HCl}\)

The compound that will not give iodoform on treatment with alkali and iodine is (a) Acetone (b) Ethanol (c) Diethyl ketone (d) isopropyl alcohol

When benzene sulphonic acid and p-nitrophenol are treated with \(\mathrm{NaHCO}_{3}\), the gases released respectively are: (a) \(\mathrm{SO}_{2}, \mathrm{NO}_{2}\) (b) \(\mathrm{SO}_{2}, \mathrm{NO}\) (c) \(\mathrm{SO}_{2}, \mathrm{CO}_{2}\) (d) \(\mathrm{CO}_{2}, \mathrm{CO}_{2}\)

Benzoyl chloride is prepared from benzoic acid by (a) \(\mathrm{Cl}_{2}\), hv (b) \(\mathrm{SO}_{2} \mathrm{Cl}_{2}\) (c) \(\mathrm{SOCl}_{2}\) (d) \(\mathrm{Cl}_{2}, \mathrm{H}_{2}^{2} \mathrm{O}\)

Schiff's reagent gives pink colour with (a) acetone (b) acetaldehyde (c) acetic acid (d) methyl acetate

Hydrogenation of benzoyl chloride in the presence of \(\mathrm{Pd}\) and \(\mathrm{BaSO}_{4}\) gives (a) benzyl alcohol (b) benzaldehyde (c) benzoic acid (d) phenol

The reagent that can be used to distinguished between methanoic acid and ethanoic acid is (a) sodium carbonate solution (b) ammonical silver nitrate solution (c) phenolphthalein (d) neutral ferric chloride solution

\(\mathrm{X}+\mathrm{CH}_{3} \mathrm{COOH} \longrightarrow\) Ester \(+\mathrm{H}_{2} \mathrm{O}, \mathrm{X}\) is (a) alcohol (b) pyridine (c) alkane (d) acid

Lactic acid on oxidation by alkaline potassium permanganate gives (a) propionic acid (b) cinnamic acid (c) pyruvic acid (d) tartaric acid

Which of the following is the weakest acid? (a) \(\mathrm{HCOOH}\) (b) \(\mathrm{CH}_{3} \mathrm{COOH}\)

Glacial acetic acid is obtained by (a) treating vinegar with dehydrating agents (b) crystallizing, separating and melting acetic acid (c) chemically separating acetic acid (d) distilling vinegar

Glacial acetic acid is obtained by (a) treating vinegar with dehydrating agents (b) crystallizing, separating and melting acetic acid (c) chemically separating acetic acid (d) distilling vinegar