Question

d. I equiv. NaSCH Br THF Br Br t) Mg ether 2) DO

Answer 1

Br Lequir. NasChz THE Here in THE mediumli.e. polas aprotic) Na SCA3 is a good nucleabhile and it con su do substitution reaction with alkyl halide. I by SN 2 mechanism. Here in the given if molecule there are two Bratom. But the SNL reaction occlure to the preferrentially leashindered position. So, the neann, N 5013 THE seus BE e. Br 1. mgletter, 2-D₂0 In the first step, the main dry ether medium reat with the molecule to give the Grignard reagent. je. IN Mg Etzo Brmy Now the molecule A react with Dgo to take upet from this Dzo like, Brug en IM Dao D₂B, Bring to do product)

Here for the part d the reaction occurs through the S_N2 mechanism so the less hindered primary carbon atom  is preferable than the more hindered secondary carbon atom.So the following bromide is replaced.

In the e part the aryl halide first react with Mg to form aryl magnesium halide which is very nucleophilic.So it takes a D readily from the D₂O to give the following dutarated aryl compound.