Question

$C{H}_3-\stackrel{\underset{|}{C_2{H}_5}}{\underset{\stackrel{|}{C{H}_3}}{C}}-\stackrel{\underset{|}{C{H}_3}}{\underset{\stackrel{|}{H}}{C}}-C\equiv C-C{H}_3$

Write the IUPAC name of the above alkyne.

Answer 1

Rules for Naming Hydrocarbons:-

Rule-I Selection of the longest carbon chain.

Rule-II Numbering the longest chain: Longest chain is numbered starting from a terminal carbon. Numbering is done is such a way that lowest possible number is given to the side cahin or a functional group.

Rule-III Writing names of branched, saturated hydrocarbons, locants are written first in alphabetical order followed by name of parent chain.

Rule-IV Some common names are retained in $IUPAC$ system for unsubstituted hydrocarbon only.

$4,5,5-trimethyl-2-heptyne$

Here,

$yne-$ for triple bond

$hept-$ for seven carbon atoms

$yl-$ for side chain