MCQ
In which of the molecule $\pi-$ electrons are not delocalized ?
- A

- B

- ✓$H_2C=C=CH_2$
- D




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$HSO_4^- = 1.2 \times 10^{- 2} ,H_2PO_4^- = 6.3 \times 10^{-8} ,$$HCO_3^- = 4.7 \times 10^{-11}$
$(A)$ $CH _{3} COOH$
$(B)$ $HCHO$
$(C)$ $CH _{3} OOCH _{3}$
$(D)$ $CH _{3} CHO$