Ncert Solutions Chemistry Class 11th

4.30. Which hybrid orbitals are used by carbon atoms in the following molecules?

(a) CH₃-CH₃ 

(b) CH₃-CH=CH₂ 

(c) CH₃-CH₂-OH

(d) CH₃-CHO

(e) CH₃COOH.

12.9. Which of the two: O₂NC         H₂CH₂O^– or CH₃CH₂O^– is expected to be more stable and why?

4.29 Considering x-axis as the inter-nuclear axis which out of the following will not form a sigma bond and why?

(a) 1s and 1s

(b) 1s and 2p_x

(c) 2p_y and 2p_y

(d) 1s and 2s

12.8. Identify the functional groups in the following compounds

4.28. What is the total number of sigma and pi bonds in the following molecules?

(a) C₂H₂ 

(b) C₂H₄

12.6. Draw formulas for the first five members of each homologous series beginning with the following compounds.
(a) H—COOH (b) CH₃COCH₃ (c) H—CH=CH₂

12.5.Which of the following represents the correct IUPAC name for the compounds concerned?(a) 2, 2-Dimethylpentane or 2-Dimethylpentane (b) 2, 4, 7-Trimethyloctane or 2, 5, 7- Trimethyloctane (c) 2-Chloro-4-methylpentane or 4-Chloro-2-methylpentane (d) But-3-yn- 1-ol or But-4-ol-yne.

12.4. Give the IUPAC names of the following compounds

4.27. Draw diagrams showing the formation of a double bond and a triple bond between carbon atoms in C₂H₄ and C₂H₂ molecules.

12.3. Write bond-line formulas for: Isopropyl alcohol, 2,3-Dimethylbutanal, Heptan-4-one.