What is the compound having $(-CHO)$ functional group called?

Carbon has four electrons in its valence shell. How does carbon attain stable electronic configuration?

Which of the following does not belong to the same homologous series?

The number of electron pairs shared by the two carbon atoms which are bonded by a triple bond are:

What is the solution of ethanol containing $5\%$ water called?

Complete the following chemical reactions and write the chemical name of the products obtained.
$(i)$ $CH_{2}=CH_{2} + H_{2}O \longrightarrow$
$(ii)$ $CH_{3}COOH + NaOH \longrightarrow$
$(iii)$ $CH_{3}CH_{2}OH \xrightarrow{H_{2}SO_{4}} $
$(iv)$ $HCOOH + Na \longrightarrow$
$(v)$ $C_{2}H_{5}OH \xrightarrow{\text{Alk. } KMnO_{4}} $