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Question

Give the structural formula for ethanal.


A

CH3CHO

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B

HCHO

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C

CH2CO

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D

CH3CH2O

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Solution

The correct option is A

CH3CHO


The explanation for the correct answer:

Option (A) CH3CHO

  • In ethanal, the prefix ‘eth’ shows the presence of 2 carbon atoms.
  • The suffix ‘al’ shows the presence of the aldehyde groupCHO.
  • So, therefore the chemical formula of ethanal is CH3CHO.
  • The structural formula of ethanal is;

  • Hence, option A CH3CHO is correct.

The explanation for the incorrect answer:-

Option (B) HCHO

  • In HCHO there is one Carbon atom and an Aldehyde groupCHO is present.
  • Since it contains only one atom the suffix will be ‘meth’.
  • It contains an Aldehyde groupCHO so the prefix will be ‘al’.
  • Therefore, the compound name is 'Methanal.
  • Hence option B HCHO is incorrect.

Option (C) CH2CO

  • In CH2CO, two Carbon atoms, two Hydrogen atoms, and one Oxygen atom are present.
  • Since it contains two atoms the suffix will be ‘eth’.
  • It contains a ketone groupCO, so the prefix will be ‘one’.
  • Therefore, the compound name is Ethanone.
  • Hence option C CH2CO is incorrect.

Option (D) CH3CH2O

  • In CH3CH2O , two Carbon atom and one Oxygen atom is present.
  • Since it contains two atoms the suffix will be ‘eth’.
  • It contains an Oxygen atom so the prefix will be ‘oxy’.
  • Therefore, the name will be ‘Ethoxy' radical.
  • Radical is the atom, molecule, or ion which has an unpaired valence electron.
  • Hence option D CH3CH2O is incorrect.

Therefore, the structural formula for ethanal is CH3CHO, option (A) is the correct answer.


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