Formation of $2-$butene as the major product by dehydration of $2-$butanol is according to:

The major product formed in the following transformation is most likely to be

Which of the following is not true in case of reaction with heated copper at $300 \ ^oC$?

$CH_3 CH_2 OH \underset{\text{step-}1}{\stackrel{Cl_2}{\longrightarrow}} CH_3 CHO$ $\underset{\text{step-}2}{\stackrel{3 Cl_2}{\longrightarrow}} Cl_3 CCHO$
In the above reactions,the role of $Cl_2$ in step-$1$ and step-$2$ respectively is:

Which of the following substances produces acetic acid upon fermentation?

The following transformation involves a carbocation rearrangement. The carbocation is generated by protonation of the hydroxyl group,followed by the loss of water. Which bond has to migrate in the carbocation to yield the product indicated (after the deprotonation)?