 Functional groups : alkene and alkyne, therefore suffix = en
and yne
 The longest continuous chain is C6 therefore root = hex
 The first point of difference requires that we number from the
left as drawn
 Locant for C=C is therefore 1
 Locant for C≡C is therefore 4
hex1en4yne

CH_{2}=CHCH_{2}C≡CCH_{3} 
 Functional groups : alkene and alkyne, therefore suffix = en
and yne
 The longest continuous chain is C6 therefore root = hex
 The first point of difference requires that we number from the
right as drawn
 Locant for C≡C is therefore 1
 Locant for C=C is therefore 4
hex4en1yne

CH_{3}CH=CHCH_{2}C≡CH 
 Functional groups : alkene and alkyne, therefore suffix = en
and yne
 The longest continuous chain is C6 therefore root = pent
 The first point of difference fails since C=C and C≡C are equally distant from the ends.
 Therefore the C=C takes priority and requires that we number from
the left as drawn
 Locant for C=C is therefore 1
 Locant for C≡C is therefore 4
pent1en4yne

CH_{2}=CHCH_{2}C≡CH 