Which of the following is an isomer of compound $(1)$?
$(1) \ CH_3CH_2CHO$
$(2) \ CH_3COCH_3$
$(3) \ CH_3CH=CHOH$
$(4) \ \text{2-methyloxirane (propylene oxide)}$

  • A
    $2$
  • B
    $4$
  • C
    $2$ and $3$
  • D
    All are isomers

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