Chemistry Class 12 NCERT Solutions: Chapter 12 Aldehydes Ketones and Carboxylic Acids Part 4

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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)

Q 5 i The 2, 4-dinitrophenylhydrazone of benzaldehyde

Q 5 I the 2, 4-Dinitrophenylhydrazone of Benzaldehyde

Q 5 i The 2, 4-dinitrophenylhydrazone of benzaldehyde

(ii)

Q 5 ii Cyclopropanone Oxime

Q 5 Ii Cyclopropanone Oxime

Q 5 ii Cyclopropanone Oxime

(iii)

(iv)

Q 5 iv The Semicarbazone of Cyclobutanone

Q 5 Iv the Semicarbazone of Cyclobutanone

Q 5 iv The Semicarbazone of Cyclobutanone

(v)

Q 5 v The ethylene Ketal of hexan-3-one

Q 5 v the Ethylene Ketal of Hexan-3-One

Q 5 v The ethylene Ketal of hexan-3-one

(vi)

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

(i) then

(ii) Tollens’ Reagent

(iii) Semicarbazide and weak acid

(iv) Excess ethanol and acid

(v) Zinc amalgam and dilute hydrochloric acid

Answer:

(i)

Q 6 i PhMgBr and then H 3 O^+

Q 6 I PhMgBr and then H 3 O^+

Q 6 i PhMgBr and then H 3 O^+

(ii)

Q 6 ii Tollens’ reagent

Q 6 Ii Tollens’ Reagent

Q 6 ii Tollens’ reagent

(iii)

Q 6 iii Semicarbazide and weak acid

Q 6 Iii Semicarbazide and Weak Acid

Q 6 iii Semicarbazide and weak acid

(iv)

Q 6 iv Excess ethanol and acid

Q 6 Iv Excess Ethanol and Acid

Q 6 iv Excess ethanol and acid

(v)

Q 6 v Zinc Amalgam and Dilute Hydrochloric Acid

Q 6 v Zinc Amalgam and Dilute Hydrochloric Acid

Q 6 v Zinc Amalgam and Dilute Hydrochloric Acid