Alkene $(x) \xrightarrow[\Delta]{KMnO_4/H^+} \text{Products}$. Identify the alkene $(x)$ from the given products:

In the reaction sequence $Me_3CCH=CH_2 \xrightarrow{Q} Me_3CCH_2CH_2OH$ and $Me_3CCH=CH_2 \xrightarrow{R} Me_3C-CH(OH)-CH_3$, $Q$ and $R$ are respectively:

Identify the major product $A$ in the following reaction.
$3-$Bromo$-2-$methylpentane $\xrightarrow{alc. KOH} A$

The compounds that will give an isomer of $2,2$-dimethylpropane on catalytic hydrogenation are:
$(1)$ $CH_3-CH=C(CH_3)_2$
$(2)$ $CH_3-CH=CH-CH_3$
$(3)$ $CH_3-CH=CH-CH_2-CH_3$
$(4)$ $CH_3-C(CH_3)=C(CH_3)-CH_3$

In polyenes that contain differently substituted $(C=C)$ double bonds,it is possible to hydrogenate chemoselectively one $(C=C)$ double bond. The product of the reaction of limonene with one mole of $H_2$ in the presence of $PtO_2$ is:

Which of the compounds with molecular formula $C_5H_{10}$ yields acetone on ozonolysis?