How many isomers can be produced from the molecular formula $C_4H_{10}O$?

The number of structural isomers for $C_6H_{14}$ is

Write the types of isomers for $C_4H_6$ (alkyne) and provide one example for each.

The number of structural isomers for the molecular formula $C_{4}H_{10}O$ is:

The total number of stereoisomers of the compound $2,4-$dichloroheptane is:

Identify the correct statements from the following. Choose the correct answer from the options given below.
$A$. Pentan$-3-$one and Pentan$-2-$one are metamers.
$B$. Butanenitrile and Butaneisonitrile are functional isomers.
$C$. Butan$-1-$ol and Butan$-2-$ol are position isomers.
$D$. Butan$-1-$amine and $N$-methylpropan$-1-$amine are homologous.