Short Answer TypeSodium salt of which acid will be needed for the preparation of propane? Write chemical equation for the reaction.
What happens when:
(i) Propyne is heated with H2 in the presence of nickel at 473 K?
(ii) Water is dropped on aluminium carbide?
(iii) Sodium propionate is heated with sodalime?
(iv) Acetic acid is treated with hydroiodic acid in the presence of red phosphorus at 420 K?
Long Answer TypeAssign reasons for the following:
(i) Boiling points of n-alkanes increase regularly with the increase in the number of carbon atoms.
(ii) Branched-chain alkanes have lesser boiling points than the straight chain alkanes.
Short Answer TypeWhat effect does branching of an alkane chain has on its boiling point ?
Branching of an alkane chain makes the molecules more compact and brings various atoms closer. As a result, the molecular size decreases. This decreases the surface area and therefore the magnitude of Vander Waal's forces also decreases. Hence the boiling point of the alkane decreases with branching.
Assign reasons for the following:
(i) All C-H bonds in methane are equivalent.
(ii) Alkanes are called paraffins.
Alkanes with even carbon atoms have higher melting points than alkanes with an odd number of carbon atoms.Explain.
Long Answer TypeShort Answer TypeWhy does the iodination of methane require an oxidising agent while so much reagent is needed in the chlorination and bromination of methane?
Long Answer TypeShort Answer Type
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