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  4. IUPAC name of the following is CH2=CH-CH2-CH2-C≡ CH

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Q. $IUPAC$ name of the following is $ CH_{2}=CH-CH_{2}-CH_{2}-C\equiv CH$

Punjab PMETPunjab PMET 2007Organic Chemistry – Some Basic Principles and Techniques

Solution:

The double bond gets priority over triple bond. So, the $ IUPAC $ name of
$\overset{1}{C}H _{2}= \overset{2}{C}H - \overset{3}{C}H _{2}- \overset{4}{C}H _{2}- \overset{5}{C} \equiv \overset{6}{C}H$
is Hex-1-en-5-yne or l-hexene-5-yne.