Which of the following homologous series has an incorrect general formula?

  • A
    Alkynes: $C_nH_{2n-2}$
  • B
    Alkanols: $C_nH_{2n+2}O$
  • C
    Alkanals: $C_nH_{2n+1}O$
  • D
    Carboxylic acids: $C_nH_{2n}O_2$

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