Catalytic hydrogenation of an optically active hydrocarbon $(X)$ yields an optically inactive compound $(Y), C_6H_{14}$. What is the hydrocarbon $(X)$?

Select the catalyst used in the hydrogenation of ethene.

Coloration of $Br_2/CCl_4$ will be discharged by

The alkene which on ozonolysis yields acetone is

$but-2-yne$ is reacted separately with one mole of $H_2$ as shown below:
$\underline{ B } \xleftarrow[\text{liq } NH_3]{Na} CH_3-C \equiv C-CH_3 \xrightarrow[\Delta]{Pd/C} \underline{ A }$
Identify the incorrect statements from the options given below:
$A.$ $A$ is more soluble than $B$.
$B.$ The boiling point and melting point of $A$ are higher and lower than $B$ respectively.
$C.$ $A$ is more polar than $B$ because dipole moment of $A$ is zero.
$D.$ $Br_2$ adds easily to $B$ than $A$.

Number of shared electrons between carbon-carbon atoms in an ethylene molecule is