${\text{Glycerol}}$ $\xrightarrow{KHSO_4} (A)$ $\xrightarrow{LiAlH_4} (B)$; $(A)$ and $(B)$ are respectively:

Identify the products $A$ and $B$ formed in the following reaction:
$CH_3 - CH_2 - CH = CH - CH_3 + HCl \to A + B$

Assertion : $trans-but-2-ene$ on reaction with bromine forms a racemic mixture.
Reason : $trans-$Compound in $trans$ addition forms two types of stereoisomers.

$HCl$ does not show the peroxide effect because the reaction mechanism involves the following steps:
$CH_3-CH=CH_2 + \dot{X} \to CH_3-\dot{C}H-CH_2X$ $(I)$
$CH_3-\dot{C}H-CH_2X + HX \to CH_3-CH_2-CH_2X + \dot{X}$ $(II)$
Why does $HCl$ fail to undergo this reaction?

In which of the following reactions will $CO_2$ gas $NOT$ be released?

The given reaction represents the ozonolysis of an alkene $A$. Identify $A$ and the product $B$ in the following reaction sequence:
$A + O_3$ $\rightarrow \text{ozonide intermediate}$ $\xrightarrow{Zn + H_2O} B + HCHO$