Question #15359

1 Answer
yumean1119
Nov 28, 2017

3-methylpentanal

Explanation:

Assume that the structure is #CH_3CH_2CH(CH_3)CH_2CHO#.
This is a kind of aldehyde.

IUPAC names an aldehyde by replacing -e to -al in the name of corresponding alkane.
http://www.ivyroses.com/Chemistry/Organic/Naming-Aldehydes.php

For example, the IUPAC name for #CH_3CHO#(acetaldehyde) is ethanal.

#CH_3CH_3# ethan#color(red)"e"#
#CH_3CHO# ethan#color(red)"al"#

[What is the name of this compound?]
If the compound has no branch, i.e. #CH_3CH_2CH_2CH_2CHO#, its name is pentanal the corresponding alkane is pentane(#CH_3CH_2CH_2CH_2CH_3#).

This compound has a #CH_3-# branch in the third place, counting #-CHO# as the first carbon.

Therefore, the IUPAC name is 3-methylpentanal.
https://pubchem.ncbi.nlm.nih.gov/compound/3-methylpentanal

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