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Chapter 1: Q75P (page 49)

Explain why the following compound is not stable

Short Answer

Expert verified

The compound is not stable due to angle strain in its conformer along the triple bond. There is about 60° angle strain.

Step by step solution

01

Stability of a molecule

A compound becomes unstable due to the angle strain. Mostly this stained conformer is obtained for cyclic molecules.

02

Reason of unstability

The triple bond carbons are sp hybridized and the others carbons are sp3 hybridized orbitals. The most stable form of a cyclohexane is chair conformer. For sp orbitals, the angle becomes 180° and in case of the above structure, angle will be different and the angle can be calculated using Baeyer formula.

180o-(360o/n)

nin this formula is no of carbon atom in a compound.

For hexagon, the angle will be = 80o-(360o/6)=120o

The angle strain becomes (180°-120°) = 60° which is a huge angle strain for the sp carbon. So, for that reason, the above structure is unstable.

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Most popular questions from this chapter

Classify the following monosaccharides:

What products are obtained when the following tertiary amines react with hydrogen peroxide followed by heat?

a.

b.

c.

d.

An unknown disaccharide gives a positive Tollens’ test. A glycosidase hydrolyzes it to d-galactose and d-mannose. When the disaccharide is treated with methyl iodide and Ag2O and then hydrolyzed with dilute HCl, the products are 2,3,4,6-tetra-O-methylgalactose and 2,3,4-tri-O-methylmannose. Propose

a structure for the disaccharide.

Excess ammonia must be used when a primary amine is synthesized by reductive amination. What product will be obtained if the reaction is carried out with excess carbonyl compound?

a. Which bond will be longer?

b. Which bond will be stronger?

  1. C-Cl or C-l
  2. C-C or C-l
  3. H-Cl or H-F
See all solutions

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