Which of the following reactions is correct?
- A$CH_2=CH-C(CH_3)_2-COOH \xrightarrow{NaOH + CaO / \Delta} CH_2=CH-CH(CH_3)_2$
- B$CH_3-CH(COOH)-CH(D)-CH_3 \xrightarrow{(i) Ag_2O, (ii) Br_2/CCl_4/\Delta} CH_3-CH(Br)-CH(D)-CH_3 + \text{Enantiomer}$
- C$CH_3-CH(F)-CH_2-NO_2 \xrightarrow{OH^{-} / H_2O, \Delta} CH_2=CH-CH_2-NO_2$
- D
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