Created by StemPy LabTwo statements about the structure of benzene are given below. Statement I: Benzene forms a triozonide, which points to three double bonds, yet only one ortho-disubstituted product is known, though a fixed Kekulé structure predicts two. Statement II: X-ray diffraction shows all six carbon to carbon bonds are long, between the single bond () and the double bond ().
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← Calcium carbide reacts with water and gives a gas X. X is passed through a red hot iron tube at 873 K and gives a liquid Y. Y is then treated with excess chlorine in ultraviolet light at 500 K and gives a solid Z. Take the atomic masses in g mol⁻¹ as H 1, C 12 and Cl 35.5. What is the molar mass of Z?The figure shows six cyclic species, I to VI. (i) I is not aromatic: its sp³ CH₂ carbon breaks the ring of π electrons. (ii) II has 6 π electrons and is aromatic. (iii) III has 6 π electrons and is aromatic. (iv) IV has 4 π electrons and fits the Hückel rule with n = 1. (v) V has 2 π electrons and is aromatic, with n = 0. (vi) VI has 10 π electrons, which fits 4n + 2 with n = 2. How many of the statements above are correct? →
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