Created by StemPy LabA student studies geometrical isomerism. The figure shows six alkenes, I to VI, each drawn in one arrangement only. For each one, the student asks whether a second form exists, cis or trans, that cannot turn into the first without breaking the bond. Which option lists all the alkenes that show geometrical isomerism?
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← 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?Two statements about the bonds in ethene and ethyne are given below. Statement I: In ethene, the C=C bond (134 pm) is shorter than the C-C bond of ethane (154 pm), and the π electron cloud lies in the plane of the six atoms. Statement II: Ethyne is linear, its C≡C bond is 120 pm long, and the electron cloud between the two carbons is cylindrically symmetrical about the internuclear axis. →
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