InterviewSolution
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InterviewSolution
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Which of the following statements are correct during halogenation of alkaneA. The yield of the alkyl halide depends upon the bond dissociation energy of the type of C-H bondB. The yield of the alkane depends upon the number of a particular type of C-H availableC. The fluoro compounds cannot be prepared because of high bond energy of F-FD. Iodo compounds cannot be prepared by this method because the backward reaction is thermodynamically more favourable |
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Answer» Correct Answer - A::B::D During the halogenation of alkanes the yield depends upon (i) Bond dissociation energy of C-H bond. More easily the bond can be cleaved, greater will be the yield of the corresponding alkyl halide. (reativity factor). `rArr` Choice (a) is correct (ii)As a chemical reaction takes place due to the collision between the molecules or radicals, more is the possibility for a type of collision, more is the possiblity of the yield corresponding to alkyl halide. Hence, if a type of C-H bond is more in number then one can expect greater number of collision of `X^dot` with the C-H bond and hence greater will be the yield (number factor) `rArr` Choice (b) is correct. (iii)During the iodination of alkanes, `CH_4+I_2 to CH_3-I+HI` due to low bond energy of HI and C-I, so backward reaction is thermodynamically more favourable Hence , choice (d) is correct . (iv)During fluorination , H-F is formed , the bond energy of HF is so very high that the exothermicity lead to explosion that is why fluoro compounds are not prepared by this method . `rArr` Choice (c ) is incorrect. |
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