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Hydrocarbons
Define the terms conformation and conformational isomerism.
The conformation of a molecule refers to different three-dimensional positions of atoms or groups relative to each other, arising from rotation about single (σ) bonds. The energy required for rotation about C-C bond or a bond is very low and such rotations usually occur readily. So, the various conformations of a molecule are freely interconvertible. This phenomenon of getting different conformations arising from rotation about a single or sigma bond is called conformational isomerism.
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Out of n-pentane, isopentane and neopentane which has lower boiling point?
During the pyrolysis of alkanes C-C bonds break in preference to C-H bond. Why?
Define cracking.
What is the function of iodic acid in the iodination of alkanes? Can we use any other substance in its place?
What is alternation effect?
Arrange the following compounds in order of their increasing boiling points:
n-Pentane, n-Hexane, Ethane, 2-2-Dimethylpentane, 2-Methylpentane.
Why is light or heat necessary to initiate chlorination reaction of alkanes?
What are conformation or rotational isomers?
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