Draw the product formed by the reaction of potassium t-butoxide with (1s,2s)-1-bromo-2-methyl-1-phenylbu tane (shown below). (draw the correct stereoisomer of the product.)

(Z)-(2-methylbut-1-en-1-yl)benzene

Explanation:

In the E2 elimination reaction, we will have a single-step mechanism. In this single step, we need an anti-peri-planar geometry. In other words, we need a specific configuration for the leaving group and the H that would be removed. These 2 atoms must have an opposite configuration when the base attacks the hydrogen.

With this in mind, we have to rotate the molecule in order to obtain the desired geometry (see figure). When we do this, the methyl group would be placed on top and the ethyl group at the bottom.  

Finally, when the elimination takes place (blue arrows) the configuration of the final alkene would be "Z" due to the previous rotation that we did in order to obtain the correct configuration for the elimination.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.