Question

Give IUPAC name for the following compound: CH3−CBr2−C≡C−CH3

Give IUPAC name for the following compound: (CH3) 3C−C≡C−CH (CH3) CH2CH3

Answer 1

CH3−CBr2−C≡C−CH3

IUPAC name = 4,4-dibromo-2-pentyne

i) longest chain contain 5 carbon and alkyne functional group

ii) start numbering from end which is close to tripple bond

iii) tripple bond come at no. 2 possition and 2 bromine at 4 no. carbon therefore name of compound is

4,4-dibromo-2-pentyne

(CH3) 3C−C≡C−CH (CH3) CH2CH3

IUPAC name = 2,2,5 trimethyl-3-heptyne

i) longest chain contain 7 carbon and alkyne functional group

ii) start numbering from end which is close to tripple bond

iii) tripple bond come at no. 3 possition and 3 methyl substitute at 2,2 and 5 no. carbon therefore name of compound is 2,2,5 trimethyl-3-heptyne