[where $\mathrm{Et} \Rightarrow-\mathrm{C}_2 \mathrm{H}_5{ }^{\mathrm{t}} \mathrm{Bu} \Rightarrow\left(\mathrm{CH}_3\right)_3 \mathrm{C}-$ ] Consider the above reaction sequence, Product "A" and Product "B" formed respectively are :
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[where $\mathrm{Et} \Rightarrow-\mathrm{C}_2 \mathrm{H}_5{ }^{\mathrm{t}} \mathrm{Bu} \Rightarrow\left(\mathrm{CH}_3\right)_3 \mathrm{C}-$ ] 
