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Which are the correct IUPAC names for H – CO₂CH₃ and CH ≡ CH…

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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

QUICK ANSWER…

D

DETAILS…  

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- CH

On the right-hand side, we have CH 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:

  1. Option A is incorrect. ethene is CH₂=CH₂ and not CH ≡ CH
  2. Option B is incorrect. we have an ester and not an alkanoic acid.
  3. C is incorrect. ethyl-methanoate would have been H-COOC₂H₅ and not H-COOCH₃.
  4. D is the correct answer.

KEY-POINTS…

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 /

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