Acetic acid and $CH_3OH$ are obtained on a large scale by the destructive distillation of:

$Ph-CH_2-C\equiv N$ $\xrightarrow[THF]{LDA}$ $\xrightarrow{CH_3I} 71\%;$ The end product of this reaction will be:

The major products $A$ and $B$ in the following reactions are respectively:
i) Benzene $\xrightarrow{Cl_2/uv, 500K} A$
ii) $1-$Methylcyclohexene $\xrightarrow{HI} B$

Arrange benzene,$n$-hexane and ethyne in decreasing order of their acidic behaviour.

An organic compound $C_4H_6$ on ozonolysis gives $HCHO$,$CO_2$,and $CH_3CHO$. The compound will be:

Which of the following products cannot be obtained in the above reaction?