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The general formula for the Alkanals is?

A. R₂CO

B. RCHO

C. ROH

D. RCOOR

QUICK ANSWER…

B

DETAILS…

Alkanals, which are also called Aldehydes have a general formula which is = RCHO

Where R = hydrogen or an alkyl group.

Now for the right answer to the above question:

1. Option A is incorrect. R₂CO = general formula for Alkanones.
2. Option B is correct. RCHO = general formula for Alkanals.
3. C is incorrect. ROH = general formula for Alkanols.
4. D is not the correct answer. RCOOR = general formula for Alkanoates or esters.

KEY-POINTS…

You may please note these/this:

• RCHO = Alkanals.
• RCOOH = Alkanoic acids.
• RCOR = Alkanones.
• RCOOR = Alkanoates.
• ROH = Alcohol.
• Where R = hydrogen or alkyl group.
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/ culled from 2020 JAMB-UTME chemistry past question 34 /