Created by StemPy LabThe figure shows four projections, I to IV, of ethane. (i) I and IV show the same conformation. (ii) The dihedral angle is in II and in III. (iii) I is higher in energy than II by about . (iv) At room temperature, I and II can be separated as two substances. (v) Turning the back carbon of II by 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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← 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?The figure shows six monosubstituted benzenes, I to VI, each nitrated in its own flask.
(i) I and IV give mainly ortho and para products.
(ii) II, III and V give mainly the meta product.
(iii) VI gives mainly the meta product, as its methyl group gives electrons to the ring.
(iv) In II, electron density falls most at ortho and para, so attack goes to meta.
(v) I reacts more slowly than benzene.
(vi) III reacts more slowly than benzene.
How many of the statements above are correct? →
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