Define power of lens and state it's S.I unit.
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Power of lens is known as the inverse of the focal length of the lens measured in meter(m). S.I unit of power = Dioptre (D) Power of lense = 1/ focal length in meter. The focal length of 1st lense f1 = 40 cm = 0.4 m. The lense used is a convex lens because the focal length is a positive value.
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General Methods of Preparation of Haloalkanes
1. From Alcohols
In Groove’s method, ZnC12 is used to weaken the C-OH bond. In case of 3° alcohols, ZnC12 is not required.
The reactivity order of halogen acids is HI > HBr > HCl.
Darzen procedure is the best method for preparing alkyl halides from alcohols since both the by products (SO2 and HCl) are gaseous and escape easily.
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