When a tertiary alcohol $A$ $(C_4H_{10}O)$ reacts with $20\% \ H_3PO_4$ at $358 \ K$,it gives a compound $B$ $(C_4H_8)$ as a major product. The $IUPAC$ name of the compound $B$ is

When $HCl$ is treated with propene in the presence of sodium peroxide,the major product obtained is

In hydroboration reaction:
$I$. $Syn$ addition takes place
$II$. Reaction proceeds through formation of a cyclic transition state
$III$. Markovnikov rule is followed in the reaction
$IV$. Anti-addition takes place and anti-Markovnikov rule is followed
Which statement$(s)$ is/are correct?

What is the product of the following reaction?
$H_2C=C_6H_{10}=CH_2 + HBr \xrightarrow{\text{peroxide}} ?$

Identify the products obtained in the ozonolysis of propene.

Explain the preparation of alkene from alkyl halide via dehydrohalogenation in detail.