Question

Structure formula of ethyne is –
(A) \[H-C\equiv C-C{{H}_{3}}\]
(B) \[H-C\equiv C-H\]
(C))

(D)

Answer 1

Hint: In this question IUPAC name of an organic compound is given and we have to find the chemical formula and structure of the given compound by using rules of IUPAC.

Complete step by step solution:
> We know that The structural formula of a chemical compound is a graphic representation of the molecular structure (determined by structural chemistry methods), showing how the atoms are possibly arranged in the real three-dimensional space and chemical formula that shows how the atoms making up a compound are arranged within the molecule. By applying the rules of IUPAC naming or structure from IUPAC naming we can find the structure of ethyne.
Here, ethyne = eth + yne
> So, here we know that in ethyne ‘eth’ is a prefix and ‘yne’ is a suffix. So, from the suffix ‘yne’ we can say that this organic compound has a triple bond in its structure. And from the ‘eth’ prefix we can say that it has two carbon atoms in its parent chain. In this compound there is not any type of naming of substituents, so we can say there will be no substituents in the structural formula of ethyne.
So, from the above explanation we can make the below given structure:

And the chemical formula is:
\[HC\equiv CH\]
So, the correct answer is option “B”.

Note: In this compound degree of unsaturation every carbon is one. And you should remember that suffix ‘ane’ is used for all single bonds, ‘ene’ is used for double bond and ‘yne’ is used for triple bond.