Bayer's reagent used to detect olefinic double bond is

$[CH_3-CH_2-CH(CH_3)-N^{+}(CH_3)_3]OH^{-} \xrightarrow{\text{pyrolysis}}$ major alkene will be

Hydrolysis of ozonide of $but-1-ene$ gives

How many products are formed in the following reaction?
$1,4$-dimethylcyclohex-$1$-ene + $HBr \rightarrow$ ?

$KO_2C-CH_2-CH_2-CO_2K \xrightarrow{\text{electrolysis}} (A) \text{ (major)}$ (Kolbe electrolysis method). The product $(A)$ of the reaction is:

The major product in the following reaction is