A student writes six statements about halogenation of…

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A student writes six statements about halogenation of alkanes. (i) In chlorinating methane, the chain starts when the Cl-Cl bond breaks, not a C-H bond. (ii) Some ethane forms because two methyl radicals join in a termination step. (iii) With excess chlorine, the reaction stops at chloromethane. (iv) Iodination needs an oxidising agent such as HIO₃, as the reaction is reversible. (v) Fluorination is the slowest of the four halogenations. (vi) A primary hydrogen is replaced faster than a tertiary one. How many of the statements above are correct?

ChemistryHardHigh School (11–12)Hydrocarbons › Alkanes NEET

A student writes six statements about halogenation of alkanes. (i) In chlorinating methane, the chain starts when the $\text{Cl}-\text{Cl}$ bond breaks, not a $\text{C}-\text{H}$ bond. (ii) Some ethane forms because two methyl radicals join in a termination step. (iii) With excess chlorine, the reaction stops at chloromethane. (iv) Iodination needs an oxidising agent such as $\text{HIO}_3$ , as the reaction is reversible. (v) Fluorination is the slowest of the four halogenations. (vi) A primary hydrogen is replaced faster than a tertiary one. How many of the statements above are correct?

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← A teacher asks four students for a laboratory route to an alkane. The rule is strict: the alkane named must be the only alkane in the product. The alkyl halides are treated with sodium in dry ether. The sodium salts are either heated with soda lime or electrolysed in water. Which route, with the product the student names, is correct?The figure shows four projections, I to IV, of ethane. (i) I and IV show the same conformation. (ii) The dihedral angle is 60° in II and in III. (iii) I is higher in energy than II by about 12.5 kJ mol⁻¹. (iv) At room temperature, I and II can be separated as two substances. (v) Turning the back carbon of II by 60° gives I. (vi) In III, the hydrogen atoms on the two carbons are as close as they can be. How many of the statements above are correct? →

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