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 TypeAssign 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 TypeChlorination of methane is a free radical reaction which occurs by the following mechanism:
3
(a) Chain initiating step:
(b) Chain propagating step.
(c) Chain terminating step:
Since during the chain propagating step, CH3 free radicals are produced. This two methyl free radicals combine together in the chain-terminating step to form an ethane (CH3 - CH3) molecule.
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