Write the IUPAC name of the compound $(A)$ which is a $2 - m e t h y l$ branched alkane having a molecular mass of $254$ . This compound is a sex-attractant and is isolated from female tiger moths.

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Solution

Given -2-methyl branched alkane
Molar Mass $= 254$

As it is alkane, So according to General formula it should be

$C_{n} H_{2 n + 2}$

$12 n + 1 (2 n + 2) = 254$

$12 n + 2 n + 2 = 254$

$14 n = 252 \Rightarrow n = 18$

So the structural formula of compound is $C_{18} H_{38}$

But since it is mentioned that 1 methyl group is in branch at 2 position of carbon chain the longest chain consist of $17 C$ -atom.

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(A)

2 - m e t h y l

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