Chemistry
(i) Give a chemical test to distinguish ethene gas and ethane gas.
(ii) Identify the statement that is incorrect about alkanes:
(A) They are hydrocarbons.
(B) There is a single covalent bond between carbon and hydrogen.
(C) They can undergo both substitution as well as addition reactions.
(D) On complete combustion they produce carbon dioxide and water.
Organic Chemistry
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Answer
(i) When bromine is passed through solutions of each of the gases in an inert solvent [CCl4] at room temperature, incase of ethene gas, brown colour of bromine is discharged whereas in case of ethane gas brown colour remains brown.
(ii) They can undergo both substitution as well as addition reactions.
Reason — The non availability of electrons in the single covalent bond makes them less reactive and therefore alkanes undergo characteristic substitution reactions only.
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