DU in (A) `(C_6H_(10))=((2xx6+2)-10)/(2)=2^@`
Reaction with `H_2SO_4+HgSO_4implies(C-=C)` bond Does not react with `[Ag(NH_3)_2]^(o+)implies` Internal alkyne
Location of `(C-=C)` bond: It should be at `(C^3-=C^4)` because `(C^4-=C^5)` is terminal alkyne, at `(C^2-=C^3)`, it is not possible because valency of carbon at `C^2` becomes 5, `C^1-=C^2)` is again a terminal alkyne and also the valency of C at `C^2` becomes 5.
Structure of A:
Attack of `overset(ө)OH` is predominant at `C-3` because positive charge on `C-3` is more stabilised due to `+I` effect of isopropyl group.