Question

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Problem 2 Give the correct IUPAC name for the following compounds a) CH CH3 CH2=CH-C- CH2 - CH - CH, CH Name: b) CI Br-C=C-CH-CH CH CH CH, Name: c) CHÚCHỤC CCHỊCHỊCH Name: орно ) Name Name 1) Name g) Br Br pour CH-CH-CH-CH-CH-CH Name Isoprene (common name) is the repeating monomeric unit of the natural polymer rubber, What is the systematic IUPAC name for isoprene? (Isoprene) Name:

Answer 1

Answer) a) 3,3,5-Trimethylhex-1-ene

b) 1-Bromo-3-chloro-hept-1-yne

c) Hept-3-yne

d) (E)-Hex-2-ene

Explanation:

a) Count the number of carbon atoms in the longest carbon chain and number them such that the double bond gets the lowest number possible.

It has six carbon, therefore parent name is Hexane.

Сиз СН3 CH₂=CH- & - CH₂ - CH - CH₂ На 다 2. 5 6 c И эрс

Double bond is at 1st carbon , therefore after hex 1 is written leading to -ene by replacing -ane. Parent name is Hex-1-ene.

The molecule has 3 methyl substituents to add third position and one at fifth position. Therefore, substituents name is 3,3,5-Trimethyl-

IUPAC name : 3,3,5-Trimethylhex-1-ene.

b) the longest carbon chain has 7 carbon atoms therefore, the parent name is heptane.

Alkyne group is present in the carbon chain therefore the carbon chain is numbered such that the alkyne group gets the lowest possible number.

8 - C=(-CH - CF, C#, CH, CHỊ 1 2 3 2 3 4 5 6 7

It is at 1st carbon atom. Therefore,- 1 is written after hept and -yne is written after 1 . Therefore , the parent name is Hept-1-yne.

It has 2 substituents: 1 bromine atom at first position and a chlorine atom at third carbon atom. Therefore, substituent name is 1-Bromo-3-chloro

IUPAC name is 1-Bromo-3-chloro-hept-1-yne

c) count the number of atoms in longest carbon chain and number them such that the alkyne group present gets the lowest number possible (count from left to right).

It has 7 carbon atoms, therefore the parent chain name is heptane.

CH₃ CECCHZ I 2.23 45-6 7

the double bond is present at third carbon atom therefore 3 is written after hept and -yne is written after 3. The IUPAC name is Hept-3-yne.

d) count the number of carbon atoms in the longest carbon chain. The longest chain has six carbon atoms , therefore the parent name is hexane. This structure has a double bond at second position therefore 2 is written after hex and -ene is written after 2 .

C 3 H cc56 CH2CH2CH3

The carbon atoms are present on the opposite side of the double bond, therefore they are trans to each other. Hence, E is written to denote trans configuration in the beginning of the IUPAC name.

Therefore, the IUPAC name is (E)-Hex-2-ene.