$A$ molecule of ammonia has the formula $NH_{3}$. Predict the total number of bonds present around the nitrogen atom.

Alkynes may be represented by the general formula:

On dropping a small piece of sodium in a test tube containing carbon compound $X$ with molecular formula $C_{2}H_{6}O$,a brisk effervescence is observed and a gas $Y$ is produced. On bringing a burning splinter at the mouth of the test tube,the gas evolved burns with a pop sound. Identify $X$ and $Y$. Also,write the chemical equation for the reaction. Write the name and structure of the product formed when you heat $X$ with excess concentrated sulphuric acid.

The name of the compound $CH_{3}-CH_{2}-CHO$ is

Draw the structure of the simplest ketone.

Which of the following statements are usually correct for carbon compounds?
$(i)$ Are good conductors of electricity
$(ii)$ Are poor conductors of electricity
$(iii)$ Have strong forces of attraction between their molecules
$(iv)$ Do not have strong forces of attraction between their molecules