[where. Et ⇒- C_2 H_5^t Bu ⇒( CH_3)_3 C -] Consider the above reaction sequence, Product " A " and Product " B " formed respectively are:

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