Williamson's synthesis of preparing dimethyl ether is a/an:
Williamson ether = SN2 type.
Electrophilic substitution
SN1 reaction
Electrophilic addition
SN2 reaction
Alkoxide attacks primary alkyl halide by SN2.

Study the diagram above and answer the following questions:
(a) How many alleles are involved in blood grouping?
(b) A person having 'AB' blood group has both dominant alleles. What is this inheritance type called?
(c) A man with 'A' blood group marries a woman with 'B' blood group. Can they have a child with 'O' blood group? Explain with the help of a cross.