The electrophile $\mathrm{Ph}_{3} \mathrm{C}$ reacts with $\left[\left(\eta^{5}-\mathrm{C}_{5} \mathrm{H}_{5}\right) \mathrm{Fe}(\mathrm{CO})_{2}\left(\mathrm{CDMe}_{2}\right)\right]^{+}$to give a product A . The product A is formed because
(a)Fe is oxidized
(b)alkyl is substituted with $\mathrm{Ph}_{3} \mathrm{C}$
(c)Fe-Ph bond is formed
(d)Alkyl is converted to alkene
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
β-hydride abstraction converts the alkyl to an η²-alkene (d).