Which of the following is not a biopolymer?

An organic compound $'A'$ has a molecular formula $C_{2}H_{6}O$. $'A'$ on oxidation gives compound $'B'$,which produces effervescence with baking soda.
$(i)$ Identify $'A'$ and $'B'$.
$(ii)$ Write the chemical reaction of $'B'$ with baking soda.

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.

Write the $IUPAC$ names of the following compounds:
$(a)$ $CH_3-CH_2-CH_2-CH_2-CH_2-CH_2-CHO$
$(b)$ $CH_3-CH_2-CH_2-CH_2-CH_2-OH$

Pentane has the molecular formula $C_5H_{12}$. It has

Alkynes may be represented by the general formula: