What is the product of Hydroboration-oxidation of but-$1$-ene?

Which of the following products are formed upon the addition reaction of $DCl$ with $3-methyl-1-butene$?

Identify the product $C$ in the following reaction sequence:
$CH_3CH_2C \equiv CH + HCl \to B \xrightarrow{HI} C$

Number of structural isomeric alkenes (molecular formula $= C_6H_{12}$) which all give $n$-hexane on hydrogenation in the presence of a metal catalyst.

$CH_3-CH=CH_2+NOCl \to P$. Identify the product.

Which process converts $1$-butene into butane?