Question

IUPAC NAME OF CH3—CH=C(CH3)2 ?

Answer 1

2 - Methyl - propane is right answer

Answer 2

The IUPAC name of the given compound is 2-methyl but-2-ene.

• The given compound is $CH_{3} - CH = C(CH_{3})_{2}$.
• IUPAC nomenclature  is a method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry.
• First we will find the longest continuous carbon chain in the structure and name it. We can see the longest chain has 4 C atoms.
• Now we will start numbering this chain. There is a double bond present in the longest C chain. Numbering should be done in such a way that the double bond gets lowest number, so we will start from right and double bond is numbered as 2.
• Now, at number 2, we have a double bond and a prefix, which is methyl group.
• According to IUPAC, first name the prefix with numbering  and then Carbon in parent chain + double bond with position + 'ene'.
• 2-methyl + but + 2-ene.

Hence, the name of the compound is 2-methyl but-2-ene.

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