BIOCHEMISTRY
ISOMERS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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High temperature and excess halogen
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Sunlight/ UV light and excess halogen
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High pressure and excess halogen
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Sunlight/ UV light and excess oxygen
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Detailed explanation-1: -The atoms attached to carbon are replaced by the other atoms or compounds to make a new product. e.g. methane reacts with Chloride in the presence of light to replace H-atom by Cl to make chloromethane.
Detailed explanation-2: -The role of the UV light The ultraviolet light is simply a source of energy, and is being used to break bonds. In fact, the energies in UV are exactly right to break the bonds in chlorine molecules to produce chlorine atoms.
Detailed explanation-3: -The function of ultraviolet light is to provide energy for the homolytic cleavage of halogen (Cl-Cl or Br-Br). The products are haloalkanes (RX) and hydrogen halides (HX). The halogenation of alkanes is a free radical subsitution reaction, in which the mechanism involves initiation, propagation and termination steps.
Detailed explanation-4: -In the presence of light, or at high temperatures, alkanes react with halogens to form alkyl halides. Reaction with chlorine gives an alkyl chloride. Reaction with bromine gives an alkyl bromide. Unsaturated hydrocarbons such as alkenes and alkynes are much more reactive than the parent alkanes.