(a) Write the name and formula of an organic compound containing a ketone functional group.
(b) Write the names and formulae for the first three members of the homologous series for chloroalkanes.
(c) How would you name the following compound?
CH₃– CH₂ – Br

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Solution

(a) Propanone (CH₃COCH₃) is one of the organic compounds comprising a ketone functional group (-CO-).

(b) The general formula of chloroalkanes (haloalkanes) is C_nH_2n₊₁-X (where, X is Cl, Br or I).

Therefore, the first three members of the chloroalkane series will be:
Chloromethane (CH₃Cl)
Chloroethane (C₂H₅Cl)
Chloropropane (C₃H₇Cl)

(c) The name of the compound is bromoethane, as the structure has the parent alkane. It contains 2 carbon atoms, and its one hydrogen atom is replaced by a halogroup (-X or bromine) atom. So, the name of the compound is bromoethane.

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