CBSE Class 10 Science 2017 · Paper 31/2/2 · Question 9
Write the molecular formula of benzene and draw its structure. List in tabular form the two properties in which covalent compounds differ from ionic compounds.
Answer
Benzene is , a six-carbon ring; covalent compounds have low melting points and conduct poorly, unlike ionic compounds.
Molecular formula of benzene: . Structure: a hexagonal ring of six carbon atoms joined by alternate single and double bonds, with one hydrogen atom on each carbon (as drawn in the figure).
The two properties in which covalent compounds differ from ionic compounds:
Melting and boiling points — covalent compounds made of separate molecules: generally low; ionic compounds: high.
Electrical conductivity — covalent compounds: generally poor conductors, as their bonding gives no ions; ionic compounds: conduct electricity when molten or dissolved in water (not as solids).
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