The formula of citric acid is shown below:
$\begin{matrix}
\,\,\,\,\,COOH \\
|\,\,\,\,\,\,\, \\
CH_{2}\, \\
|\,\,\,\,\, \\
HO-C-COOH \\
|\,\,\,\,\, \\
\,CH_{2} \\
|\,\,\,\,\, \\
\,\,\,\,\,\,COOH \\
\end{matrix}$
State the name of the $-COOH$ functional group present in citric acid.

While cooking,if the bottom of the vessel is getting blackened on the outside,it means that:

Select alkenes and alkynes from the following:
$C_{2}H_{4}, C_{3}H_{4}, C_{2}H_{2}, C_{4}H_{8}$

Write the name and general formula of a chain of hydrocarbons in which an addition reaction with hydrogen is possible. State the essential condition for an addition reaction. Stating this condition,write a chemical equation giving the name of the reactant and the product of the reaction.

What is the molecular formula of ethanoic acid (acetic acid)?

Write true or false for the following statement:
Esters react in the presence of an acid or a base to give back the alcohol and carboxylic acid.