What do the solid wedge and dashed wedge symbols indicate in the 3D representation of an organic molecule?

State True or False for the following statements:
$(i)$ Organic compound was first synthesized by $F$. Wohler.
$(ii)$ Berzelius stated that some mysterious force exists in living organisms.
$(iii)$ In $1828$,Wohler prepared an organic compound from an inorganic compound,at which time the vital force theory was accepted.
$(iv)$ Kolbe prepared acetic acid and Berthelot prepared methane.

Which is correctly matched?

Allyl isocyanide has:

Which of the following $C_6H_6$ compounds has a single set of structurally equivalent hydrogen atoms? The structures are labeled $I$ to $V$ as shown in the image.

Given below are two statements:
Statement-$I$ : Compound $(X)$,shown below,dissolves in $NaHCO_3$ solution and has two chiral carbon atoms.
Statement-$II$ : Compound $(Y)$,shown below,has two carbons with $sp^3$ hybridization,one carbon with $sp^2$ and one carbon with $sp$ hybridization.
In the light of the above statements,choose the correct answer from the options given below: