Question

Consider the following statements
(a) structural formula of $2 - $ butyne contains one triple bond and four single bonds between carbon atoms
(b) Both alcohol and carboxylic acid react with sodium metal to give hydrogen gas with effervescence
(c) esters are used in making perfumes and flavouring agents
(d) ethyl alcohol is obtained by the fermentation of molasses with enzymes in the absence of air

Answer 1

Hint: Structural formula of two butyne will have to draw the structures and then decide. Alcohol reacts with sodium metal due to its acidic nature to release hydrogen gas.

Complete Solution :
-We know that the structure of $2$-butyne is $C{H_3}CCC{H_3}$ which is having a triple bond and two single bonds between carbon atoms, So this option is incorrect.
-Both alcohols and carboxylic acid react with sodium metal to evolve hydrogen gas. So this option is correct.
- Esters are used in making perfumes due to their flavoured nature. So this option is also correct.
-Ethyl alcohol is formed by the fermentation of molasses with invertase enzyme in the absence of air. This option is also correct.
-Therefore option b, c, d are correct except a So, the correct answer is “Option D”.

Note: Molasses fermentation is a biological process in which sucrose from molasses is converted into cellular energy that eventually produces ethanol and carbon dioxide.