Chapter 25

Stephens reaction is used in the preparation of (a) Carboxylic acids (b) ketones (c) Alcohol (d) Aldehydes

Formaldehyde is treated with methylmagnesium iodide in dry ether and finally with water. The product obtained is (a) Isopropyl alcohol (b) Ethyl alcohol. (c) methyl alcohol (d) \(n\)-propyl alcohol

When acetone is treated with perbenzoic acid. the compound formed is: (a) Methyl methanoate (b) Methyl ethanoate (c) Mesityl oxide (d) Diacetone alcohol

Which of the following reagents reacts differently with HCHO, \(\mathrm{CH}_{3} \mathrm{CHO}\) and \(\mathrm{CH}_{3} \mathrm{COCH}_{3} ?\) (a) \(\mathrm{HCN}\) (b) \(\mathrm{NH}_{2} \mathrm{NH}_{2}\) (c) \(\mathrm{NH}_{2} \mathrm{OH}\) (d) \(\mathrm{NH}_{3}\)

An organie campound \((X)\) on heating with \(\mathrm{K}_{2} \mathrm{CrO}_{2}\) and \(\mathrm{H}_{2} \mathrm{SO}_{4}\) gives another compound (Y). The latier on heating with \(\mathrm{I}_{2}\) and \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) solution forms triodomethane. Among the following, which one could be the compound (X)? (a) \(\mathrm{CH}_{3} \mathrm{COCH}_{3}\) (b) \(\mathrm{CH}_{3} \mathrm{OH}\) (c) \(\mathrm{CH}_{3} \mathrm{CHO}\) (d) \(\mathrm{CH}_{3} \mathrm{CHOHCH}_{3}\)

Which one of the following aldehyde will not form aldol when treated with dilute NaOH? (a) \(\mathrm{CH}_{3} \mathrm{CHO}\) (b) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHO}\) (c) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCHO}\) (d) \(\mathrm{P} \mathrm{ACH}_{2} \mathrm{CHO}\)

Clemmensen reduction of aldehydic and ketonic carbonyl groups into methylene group is effected by the reagent (a) \(\mathrm{H}_{2}, \mathrm{Pd}\) (b) \(\operatorname{LiAlH}_{4}\) (c) \(\mathrm{Zn}-\mathrm{Hg}\), concentrated \(\mathrm{HCl}\) (d) \(\mathrm{NH}_{2} \mathrm{NH}_{2}, \mathrm{KOH}\)

Which of the following has the most acidic hydrogen ? (a) \(\mathrm{CH}_{3} \mathrm{COCH}_{3}\) (b) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{CH}_{2}\) (c) \(\mathrm{CH}_{3} \mathrm{COCH}_{2} \mathrm{COCH}_{3}\) (d) \(\left(\mathrm{CH}_{3} \mathrm{CO}\right)_{3} \mathrm{CH}\)

An organic compound 'A', on oxidation, consumes one mole of periodic acid and yields one mole each of acetaldehyde and acetic acid. What would be the structure of ' \(A\) '? (a) \(\mathrm{CH}_{3} \mathrm{COCHOHCH}_{3}\) (b) \(\mathrm{CH}_{3} \mathrm{COCOCH}_{3}\) (c) \(\mathrm{CH}_{3} \mathrm{CHOHCHOHCH}_{3}\) (d) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHOHCHO}\)

When acetone is saturated with dry HCl gas, it undergoes a condensation reaction to form a trimer. The trimer is (a) Phorone (b) mesityl oxide (c) mesitylene (d) diacetone alcohol

lodoform test is not given by : (a) 2-pentanone (b) 3-pentanone (c) Ethanal (d) Ethanol

In the reaction \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{O} \frac{1 . \mathrm{CH}_{3} \mathrm{MgBr}}{2 . \mathrm{H}_{2} \mathrm{O}}{\rightarrow} \mathrm{X}\) The product \((X)\) is (a) \(\mathrm{CH}_{3} \mathrm{OH}\) (b) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\) (c) \(\mathrm{CH}_{3} \mathrm{CHOHCH}_{3}\) (d) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}\)

In the given reaction : \(\mathrm{CH}_{3}-\mathrm{CHO} \stackrel{\mathrm{SeO}_{2}}{\longrightarrow}[\mathrm{X}]\) [X] will be: (a) Ethanoic acid (b) Methanoic acid (c) Ethanedial (d) Propanedial

Hybridization of carbonyl carbon in benzaldehyde is: (a) \(\mathrm{sp}^{2}\) (b) \(\mathrm{sp}^{3}\) (c) \(\mathrm{sp}\) (d) \(\mathrm{sp}^{3} \mathrm{~d}\)

An organic compound, \(\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}\) does not give a precipitate with 2, 4 dinitrophenylhydrazine reagent and does not react with metallic sodium. It could be (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{CHO}\) (b) \(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}_{2} \mathrm{OH}\) (c) \(\mathrm{CH}_{3}-\mathrm{CO}-\mathrm{CH}_{3}\) (d) \(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{O}-\mathrm{CH}_{3}\)

Which of the following will respond to Cannizzaro's reaction? (a) 2, 2. Dimethylpropanal (b) Acetaldehyde (c) Propianaldehyde (d) Cinnamaldehyde

\(m\)-Chlorobenzaldehyde on reaction with conc. KOH at room temperature gives (a) Potassium \(m\)-chlorobenzene and \(m\)-hydroxybenzaldehyde (b) \(m\)-Hydroxybenzaldehyde and \(m\)-chlorobenzyl alcohol (c) \(m\)-Chlorobenzyl alcohol and \(m\)-Hydroxybenzyl alcohol (d) Potassium \(m\)-chlorobenzoate and \(m\)-chlorobenzyl alcohol

The smallest ketone and its next homologue are reacted with \(\mathrm{NH}_{2} \mathrm{OH}\) to form oxime: (a) two different oximes are formed (b) three different oximes are formed (c) two oximes are optically active (d) all oximes are optically active

Which one of the following undergoes reaction with \(50 \%\) sodium hydroxide solution to give the corresponding alcohol and acid ? (a) Phenol (b) Benzaldehyde (d) Benzoic Acid (c) Butanol (d) Benzoic Acid

Which of the following has the most acidic hydrogen? (a) 3 -hexanone (b) 2, 4 -hexanedione (c) 2,5 -hexanedione (d) 2, 3-hexanedione

Cannizzaro's reaction is not given by (a) \(\mathrm{CH}_{3} \mathrm{CHO}\) (b) \(\mathrm{HCHO}\) (c) benzaldehyde (d) trimethyl acetaldehyde

Benzaldehyde can be prepared by the hydrolysis of (a) Benzal chloride (b) Benzotrichloride (c) benzyl chloride (d) benzonitrile

Which of the following contains the Rochelle's salt? (a) fehling's solution (b) benedict solution (c) tollen's resgent (d) schiff's reagent