How many primary alcohol isomers are there for $C_5H_{11}OH$?

$A \xrightarrow{KOBr} CHBr_3$
Here $A$ is:

The sum of the number of $\alpha$-hydrogen atoms present in compounds $A$ and $B$ is:

Describe the reactions of alcohols with $(a)$ $HX$ and Lucas test,$(b)$ $PX_3$,and $(c)$ dehydration reactions.

Given below are two statements:
Statement $(I)$: The boiling points of alcohols and phenols increase with an increase in the number of $C$ atoms.
Statement $(II)$: The boiling points of alcohols and phenols are higher in comparison to other classes of compounds such as ethers and haloalkanes.
In the light of the above statements,choose the correct answer from the options given below:

Write the main product of the given reactions:
$1$. $(CH_3)_2CHCHBrCH_3 \xrightarrow[ethanol]{KOH, \Delta }$
$2$. $(CH_3)_2CHCH(OH)CH_3 \xrightarrow{H_2SO_4, \Delta }$