Which of the following substances will produce acetaldehyde in the presence of an aqueous solution?

How many structural isomers of alcohols with the formula $C_4H_9OH$ are possible if all the carbons are in a straight chain?

Catalytic dehydrogenation of a primary alcohol gives a

Which of the following alcohols has the lowest boiling point?

An organic liquid $A$ containing $C$,$H$,and $O$ has a pleasant odour with a boiling point of $78\ ^\circ C$. On boiling $A$ with conc. $H_2SO_4$,a colourless gas is produced which decolourises bromine water and alkaline $KMnO_4$. One mole of this gas also reacts with one mole of $H_2$. The organic liquid $A$ is:

Among the following,the one that gives a positive iodoform test upon reaction with $I_2$ and $NaOH$ is