Reaction of but$-2-$ene with acidic $KMnO_4$ gives:

Why is $CCl_{4}$ added in the bromination of an alkene?

Compound $(A)$ is formed by the reaction of cyclooctatetraene with $(3 \text{ mole})$ of $CH_2I_2$ in the presence of $Zn/Cu$. Identify compound $(A)$.

An organic compound $'A'$ $(C_4H_8)$ on treatment with $KMnO_4 / H^{+}$ yields compound $'B'$ $(C_3H_6O)$. Compound $'A'$ also yields compound $'B'$ on ozonolysis. Compound $'A'$ is:

Which reaction will yield $CH_2 = C = CH_2$?

Given below are two statements $:$
Statement $I :$ Ozonolysis followed by treatment with $Zn, H_2O$ of $cis-2-butene$ gives ethanal.
Statement $II :$ The product obtained by ozonolysis followed by treatment with $Zn, H_2O$ of $3,6-dimethyloct-4-ene$ has no chiral carbon atom.
In the light of the above statements,choose the correct answer from the options given below.