Hint:Esters are a class of compounds widely distributed in nature. They have the general formula
[ $R$ and represent generic carbon group]
The simple esters tend to have pleasant Odour. In many cases, although not exclusively so, the characteristic flavours and fragrances of flowers and fruits are due to compounds with the ester functional group.
Complete step by step answer:
Esters have a fruity smell because fruit gets their aromas from esters. The aroma of an ester is produced when alcohol combines with a carboxylic group (carbon bonded with oxygen atoms). Esters smell partly because they exhibit weak intermolecular forces. This allows ester molecules to enter the gas phase and reach your nose. There are no strongly positively polarized hydrogen in esters to participate in hydrogen bonding. Consider for example ethyl butyrate, which smells like pineapples.
So, fruity smell is given by esters.
And hence the correct option is A.
Additional Information:
In chemistry, an ester is a chemical compound derived from an acid (organic or inorganic) in which at least one \[-OH\](hydroxyl) group is replaced by \[R - O - \](alkoxy) group. Usually, esters are derived from the substitution reaction of a carboxylic acid and an alcohol. Glycerides, which are fatty acid esters of glycerol, are imported esters in biology, being one of the main classes of lipids, and making up the bulk of animals fats and vegetable oils. Estes with low molecular weight are commonly used as fragrances and found in essential oils and pheromones.
Note:
Chloroform is a clear liquid with an Ether-like Odour and a slightly sweet taste. Chloroform can be formed during the break-down of chlorine-containing compounds and may be found in small amounts in chlorinated drinking or swimming pool water.
