Chemistry Class 11 NCERT Solutions: Chapter 12 Organic Chemistry Some Basic Principles and Techniques Part 4

Q: 7. Give condensed and bond line structural formulas and identify the functional group(s) present, if any, for:

(A) Equation Trimethylpentane

(B) 2 – Hydroxy Equation propanetricarboxylic acid

(C) Hexanedial

Answer:

(A) Equation Trimethylpentane

Condensed formula:

Equation

Bond line formula:

(B) 2- hydroxy Equation propanetricarboxylic acid

Condensed Formula:

Equation

Bond line formula:

The functional groups present in the given compound are carboxylic acid Equation and alcoholic Equation groups.

(C) Hexanedial

Condensed Formula:

Equation

Bond line Formula:

The functional group present in the given compound is aldehyde Equation

Q: 8. Identify the functional groups in the following compounds

(A)

(B)

(C)

Answer

The functional groups present in the given compounds are:

(A) Aldehyde Equation

Hydroxyl Equation ,

Methoxy Equation ,

C=C double bond Equation

(B) Amino Equation ,

Ketone Equation ,

Diethylamine Equation

(C) Nitro Equation ,

C=C double bond Equation

Q: 9. Which of the two: Equation or Equation is expected to be more stable and why?

Answer

Equation group is an electron – withdrawing group. Hence, it shows –I effect. By withdrawing the electrons toward it, the Equation group decreases the negative charge on the compound, thereby stabilising it. On the other hand, ethyl group is an electron3releasing group. Hence, the ethyl group shows +I effect. This increases the negative charge on the compound, thereby destabilising it. Hence, Equation is expected to be more stable than Equation

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