Uses of Aldehydes and Ketones Questions in English

(N/A) $i$. Aldehydes,ketones,and carboxylic acids are widespread in the plant and animal kingdoms.
$ii$. They play an important role in the biochemical processes of life.
$iii$. They add fragrance and flavour to nature; for example,vanillin (from vanilla beans),salicylaldehyde (from meadowsweet),and cinnamaldehyde (from cinnamon) have very pleasant fragrances.
$iv$. They are used in many food products and pharmaceuticals to add flavours.
$v$. Some of these families are manufactured for use as solvents (e.g.,acetone) and for preparing materials like adhesives,paints,resins,perfumes,plastics,fabrics,etc.

(N/A) $(i)$ Use of formaldehyde:
$(a)$ $40 \%$ solution of formaldehyde is known as formalin,which is used to preserve biological specimens.
$(b)$ It is used in the manufacturing of bakelite (phenol-formaldehyde resin),urea-formaldehyde glues,and other polymeric compounds.
$(ii)$ Use of acetaldehyde: It is primarily used as a starting material for the production of acetic acid,ethyl acetate,vinyl acetate,polymers,and pharmaceuticals.
$(iii)$ Use of benzaldehyde: It is used in the perfumery and dye industries.
$(iv)$ Acetone and ethyl methyl ketone are commonly used as industrial solvents.
$(v)$ Compounds like butyraldehyde,vanillin,acetophenone,and camphor are used for their characteristic odors and flavors.

(B) Benzaldehyde is widely used in the perfume industry due to its characteristic almond-like odor.
It is an aromatic aldehyde used as a flavoring agent and in the synthesis of various organic compounds.
Therefore,the correct option is $B$.

(A) $Formalin$ is a $40\%$ aqueous solution of $methanal$ $(formaldehyde)$. It is primarily used for the preservation of biological and anatomical specimens because it prevents the decay of tissues by cross-linking proteins.