MHT CET PYQs for Aldehydes, Ketones and Carboxylic Acids with Solutions: Practice MHT CET Previous Year Questions

1.

Which from the following is NOT a monocarboxylic acid?

• Toluic acid
• Acrylic acid
• Phthalic acid
• Isobutyric acid

2.

Identify the product obtained when isopropyl magnesium chloride in dry ether reacts with dry ice forming a complex, hydrolysed further.

• Propanoic acid
• Propanal
• 2 - Methylpropanoic acid
• 2 - Methylpropanol

3.

What is the product formed on Rosenmund reduction of benzoyl chloride ?

• Benzene
• Benzyl alcohol
• Benzaldehyde
• Chlorobenzene

4.

Identify the aldehyde from following so that the aldehydic group is NOT attached with any \(sp^3\) hybrid 'c' atom.

• Methanal
• Ethanal
• 2-Methyl Propanal
• Propanal

5.

Identify the reagent used in following reaction.
\(\text{Benzoic acid}\rightarrow _{\Delta \,}^{\text{Reagent}\,}\text{Benzoyl chloride}+\text{phosphorous oxychloride}+\text{Hydrogen chloride}\)

• \(\text{PCl}_3\)
• \(\text{HCl}\)
• \(\text{PCl}_5\)
• \(\text{SOCl}_2\)

6.

Identify the compound obtained when ethyl methyl ketone is treated with \(\text{CH}_3\text{MgBr}\) and hydrolyzed.

• \((\text{CH}_3)_3\text{C}-\text{OH}\)
• \(\text{C}_2\text{H}_5-\overset{\overset{\text{CH}_3}{|}}{\underset{\underset{\text{CH}_3}{|}}{\text{C}}}-\text{OH}\)
• \((\text{C}_2\text{H}_5)_3\,\text{C}-\text{OH}\)
• \(\text{CH}_3-\overset{\overset{\text{C}_2\text{H}_5}{|}}{\underset{\underset{\text{C}_2\text{H}_5}{|}}{\text{C}}}-\text{OH}\)

7.

Which of the following reaction represents Rosenmund reduction ?

• \(\text{R}-\text{CO}-\text{Cl}\rightarrow _{\text{Pd}-\text{BaSO}_4\,}^{\text{H}_2\,}\text{R}-\text{CHO}+\text{HCl}\)
• \(\text{R}-\text{CN}\rightarrow _{\text{H}_3\text{O}^+\,}^{\text{SnCl}_2,\text{HCl}\,}\text{R}-\text{CHO}+\text{NH}_4\text{Cl}\)
• \(\text{R}-\text{CHO}\rightarrow _{\Delta \,}^{\text{Zn}-\text{Hg conc.HCl}\,}\text{R}-\text{CH}_3+\text{H}_2\text{O}\)
• \(\text{R}-\text{CO}-\text{R}\rightarrow _{\text{ii) KOH, HO}-\text{CH}_2-\text{CH}_2-\text{OH}, \Delta \,}^{\text{i) H}_2\text{N}-\text{NH}_2\,}\text{R}-\text{CH}_2-\text{R}\)

8.

Identify 'B' in the following reaction
Ethyl cyanide \(\overset{\text{H}_2\text{O}\,}{\rightarrow }\text{A}\overset{\text{H}_2\text{O / dil HCl}\,}{\rightarrow }\text{B}+\text{NH}_3\)

• Ethanoic acid
• Ethanamide
• Propanoic acid
• Propanamide

9.

Identify the reagent 'R' used in the following reaction
\(\text{C}_6\text{H}_5\text{COCl}\overset{\text{R}\,}{\rightarrow }\text{C}_6\text{H}_5\text{CHO}+\text{HCl}\)

• \(\text{CO},\text{HCl}\)
• \(\text{H}_2,\text{Pd}-\text{BaSO}_4\)
• \(\text{DIBAl}-\text{H}\)
• \(\text{H}_2\text{O}\)

10.

Identify the product 'Y' in the following reaction \(\text{Benzonitrile}\overset{\text{C}_6\text{H}_5\text{MgBr}/\text{dry ether}\,}{\rightarrow }X\overset{\text{H}_3\text{O}^+\,}{\rightarrow }Y+\text{MgBr(OH)}+\text{NH}_3\)

• Benzophenone
• Benzylalcohol
• Benzaldehyde
• Benzoic acid

11.

Which from the following aldehydes contains two \(-\text{CHO}\) groups in a molecule?

• Acrolein
• O-Tolualdehyde
• Phthaldehyde
• Butyraldehyde

12.

Identify the product 'B' in the following reaction
\(\text{Isopropyl cyanide}\overset{\text{SnCl}_2,\text{HCl}\,}{\rightarrow }\text{A}\overset{\text{H}_3\text{O}^+\,}{\rightarrow }\text{B}+\text{NH}_4\text{Cl}\)

• Propanal
• Propanone
• 2-Methylpropanal
• 2-Methylpropanoic acid

13.

Identify the 'product' in the following reaction.
Pent - 3 - enenitrile \(\rightarrow _{\text{H}_3\text{O}^+\,}^{\text{Al H (i-Bu)}_2\,}\) Product

• Pent - 3 - en - 1 - amine
• Pentanal
• Pent - 3 - enal
• Pent - 3 - en -1 - ol

14.

Which among the following is an aromatic aldehyde ?

15.

Benzonitrile on reaction with a reagent in dry ether followed by hydrolysis forms benzophenone along with ammonia and hydroxymagnesium bromide. Identify the reagent used in above transformation.

• \(\text{C}_6\text{H}_5\text{MgCl}\)
• \(\text{C}_2\text{H}_5\text{MgBr}\)
• \(\text{C}_6\text{H}_5\text{MgI}\)
• \(\text{C}_6\text{H}_5\text{MgBr}\)