Question

Give the $IUPAC$ name of compound.

$C{H}_3-\underset{Cl}{\underset{|}{CH}}-\underset{I}{\underset{|}{CH}}-C{H}_3$

Answer 1

$\stackrel{1}{C}{H}_3-\stackrel{2}{\underset{|}{C}H}-\stackrel{3}{\underset{|}{C}H}-\stackrel{4}{C}{H}_3$

$Cl$ $I$

When there are two or more halogen groups attached to the parent chain, then that halogen will be given higher priority which alphabetically comes first.

So priority order in halogen will be: $Br>Cl>F>I$

Thus the IUPAC name of the given compound will be:

$2-chloro-3-iodobutane$