Chemistry Carboxylic Acids ETEA 2023
PMDC Verified Question 30 of 94
The IUPAC name of formyl chloride is:
A
Chloro methanoic acid
B
Chloro methane
C
Methanoyl chloride
D
Chloromethanoate
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Methanoyl chloride
Concept:

Formyl chloride is the simplest possible acid chloride, derived from formic acid. IUPAC rules dictate naming acid chlorides by replacing the "-ic acid" suffix of the parent acid with "-oyl chloride".

Formula:

$$ \text{H-COCl} $$

Solution:

  • The parent carboxylic acid with 1 carbon atom is methanoic acid.


  • Following the IUPAC rule, drop the "-ic acid" and add "-oyl chloride".


  • This yields the correct IUPAC name: methanoyl chloride.


Why other options are incorrect:

Chloro methanoic acid incorrectly implies it's still an acid. Chloro methane is \( \text{CH}_3\text{Cl} \). Chloromethanoate implies an ester.

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