Question

11. Indicate the order of stability CH н сн. Br CH сH, На н н. Br H H н н" Br н H н н н' Br н A В C D 12. Which of the following structures does NOT have tetrahedral geometry around any of its central central atoms. Use resonance to help explain A. В. с. D. = NH2 13. Is it theoretically possible to separate the pair of compounds below by distillation? Explain briefly CH CHs Br Br 14) Provide a Fischer projection of (2s,3R,4S)-2,3,4-trichloroheptane. What can be said about this compound?

Answer 1

Question 11.

A > D > B > C

Explanation:

'A' is the staggered form, in which there is no steric crowding of any moieties, hence it is the most stable.

'D' is Gauche form, which is comparatively less stable than 'A' due to some extent of steric interaction between CH3 and Br.

'B' is the eclipsed form in which the H and Br, CH3 and H have eclipsing steric interactions, hence it competitively less stable than 'B'.

'C' is the eclipsed form in which CH3 and Br have strong steric interactions, as a result, 'C' is the least stable form.

Question 12. Molecule C

Explanation: All the atoms (C, N, O) are having sp2-hybridization in molecule C. Hence, none of the central atoms in the molecule C is tetrahedral.