C - H bond lengths in benzene are:
Correct answer: B. 1.09 Å
- A. 0.99 Å
- B. 1.09 Å
- C. 1.12 Å
- D. 1.397 Å
Explanation
Carbon-hydrogen bonds have a bond length of about 1.09 Å (1.09 × 10−10 m) and a bond energy of about 413 kJ/mol (see table below). Using Pauling's scale-C (2.55) and H (2.2)-the electronegativity difference between these two atoms is 0.35.
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About Benzene and Aromatic Compounds
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
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Molecular mass of benzene is determined by:
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