Reduction of methyl isocyanide gives:

Which foul-smelling substance is formed when methylamine reacts with chloroform and ethanolic caustic alkali?

What is the correct decreasing order of basic strength?

Isomeric amines with molecular formula $C_8H_{11}N$ give the following tests:
Isomer $(P) \Rightarrow$ Can be prepared by Gabriel phthalimide synthesis.
Isomer $(Q) \Rightarrow$ Reacts with Hinsberg's reagent to give a solid insoluble in $NaOH$.
Isomer $(R) \Rightarrow$ Reacts with $HONO$ followed by $\beta$-naphthol in $NaOH$ to give a red dye.
Isomers $(P), (Q)$ and $(R)$ respectively are:

In the following sequence of reaction,identify the major product $B$.

Aniline with solid $KOH$ and $CS_2$ gives :