Which are the correct IUPAC names for H – CO₂CH₃ and CH ≡ CH…
Which are the correct IUPAC names for H – CO₂CH₃ and CH ≡ CH
A. Methyl methanoate and ethene
B. Methanoic acid and ethyne
C. Ethyl methanoate and ethyne
D. Methyl methanoate and ethyne
H – CO₂CH₃ is actually an ester with the formula H – COOCH₃
And CH ≡ CH is ethyne
Now, when naming an ester, you should split it into three with -OO- at the middle. All the carbon atoms must be counted starting from the right-hand side of -OO-.
So, we will split the ester into three like this:
HC -OO- CH₃
On the right-hand side, we have CH₃ which is methyl,
Then we count all the carbons on the left-hand side of -OO-
On the left-hand side, we have H-C = one carbon = methanoate.
So, H – CO₂CH₃ is named methyl-methanoate.
Now for the right answer to the above question:
- Option A is incorrect. ethene is CH₂=CH₂ and not CH ≡ CH
- Option B is incorrect. we have an ester and not an alkanoic acid.
- C is incorrect. ethyl-methanoate would have been H-COOC₂H₅ and not H-COOCH₃.
- D is the correct answer.
You may please note these/this:
- When naming an ester, split the formula into three parts with -OO- at the middle.
- Start naming from the right-hand side before the left and count all the carbons on both sides of -OO-.
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/ culled from 2015 JAMB-UTME Chemistry past question 2 /