In how many of the following reactions major product is a meso compound?
a)  b)  
c)  d)  
e)  f)  
g)  

(a) Anti addition, but alkene is not symmetrical, product is racemic mixture.
(b) Trans alkene $\Rightarrow$ syn addition $\Rightarrow$ racemic mixture product, as epoxide is formed.
(c)  
(d)  
(e)   
(f) Racemic mixture is obtained. Meso cannot be obtained in this reaction as alkene is not symmetrical.
(g) First cis alkene, then sys addition of – OH group, so meso product