Chapter 112 of 2363 min read
Alkanes: conformations and reactions
Why this is asked: Ethane's anti-staggered conformation is the most stable (zero torsional strain) and the fully eclipsed one the least — tested via potential-energy-vs-dihedral-angle graphs, not just the word "staggered." In free-radical halogenation, bromination is far more selective for 3° C–H than chlorination — "both give the same product ratio" is the trap.
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- •How many products (including stereoisomers) are expected from the monochlorination of the compound shown?
- •Given below are two statements: Statement I: The boiling points of the three isomeric pentanes follow the order n-pentane > isopentane > neopentane. Statement II: When branching increases, the molecule attains the shape of a sphere. This results in a smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point. In the light of the above statements, choose the most appropriate answer from the options given below:
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