Question

Write down the IUPAC name for the following 2 compounds

Br C1

CH, Н.С

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Answer #1

1. The carbon chain having more number of carbon will be the main chain and will be named accordingly.

2. If there are multiple substituents then they should be sorted priority wise.

3. numbering of the main chain will be done in such a way so that more prior substituent will be bonded to the carbon bearing lower number.

4. substituent will have more priority than unsaturation (double bond or triple bond).

2 Br 4 3 1 CI 1-bromo-3-chlorobutane 6 7 CH3 2 3 4 5 H3C 1 hept-3-yne

In first structure there are four main chain carbon and Br is pior to Cl because of molecular mass.

So name is

1-bromo-3-chlorobutane

In second structure there are seven main chain carbon and there is triple bond So name is

hept-3-yne.

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