Question

The IUPAC name of the following compound is :
(A) 3, 5-dimethyl-4-propylhept-1-en-6-yne
(B) 3-methyl-4-(1-methylprop-2-ynyl)-1-heptene
(C) 3-methyl-4-(3-methylprop-1-enyl)-1-heptyne
(D) 3, 5-dimethyl-4-propylhept-6-en-1-yne

Answer 1

Answer:

option 3

Explanation:

by following the IUPAC rules

Answer 2

The IUPAC name of the given compound is :

(A) 3, 5-dimethyl-4-propylhept-1-en-6-yne

• In a compound having both double and triple bonds at the terminal positions, the double bond gets the priority and is assigned the first position in chain.

• Therefore, the double bond or alkene group at the first position in the compound is designated as '1-en'.

• At the third and fifth positions, there are two methyl groups designated as '3,5-dimethyl' in the nomenclature.

• At the fourth position, a chain of three carbon atoms is attached, named as '4-propyl' in the nomenclature.

• At the 6th position, we have a triple bond or alkyne group, named as '6-yne' in the compound.

• The longest carbon chain in the compound is the one consisting of seven carbon atoms, represented as 'hept', starting from the double bond to the triple bond.

• Now, arranging the names of methyl and propyl substituents in the alphabetical order, and writing the double bond before triple bond, we finally have the nomenclature of the compound as 3, 5-dimethyl-4-propylhept-1-en-6-yne.