Chemistry Class 12 NCERT Solutions: Chapter 12 Aldehydes Ketones and Carboxylic Acids Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q: 5. Draw structures of the following derivatives.

(i) The 2,4-dinitrophenylhydrazone of benzaldehyde

(ii) Cyclopropanone oxime

(iii) Acetaldehydedimethylacetal

(iv) The Semicarbazone of cyclobutanone

(v) The ethylene Ketal of hexan-3-one

(vi) The methyl hemiacetal of formaldehyde

Answer:

(i)

The 2,4-Dinitrophenylhydrazone of Benzaldehyde

(ii)

Cyclopropanone Oxime

(iii)

Acetaldehydedimethylacetal

(iv)

The Semicarbazone of Cyclobutanone

(v)

The Ethylene Ketal of Hexan-3-One

(vi)

The Methyl Hemiacetal of Formaldehyde

Q: 6. Predict the products formed when cyclohexanecarboxaldehyde reacts with following reagents.

(i) and then

(ii) Tollens՚ Reagent

(iii) Semicarbazide and weak acid

(iv) Excess ethanol and acid

(v) Zinc amalgam and dilute hydrochloric acid

Answer:

(i)

PhMgBr and then H3O +

(ii)

Tollens՚ Reagent

(iii)

Semicarbazide and Weak Acid

(iv)

Excess Ethanol and Acid

(v)

Zinc Amalgam and Dilute Hydrochloric Acid

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