Question

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne ?
A. $HCl$
B. ${{O}_{2}}$
C. $B{{r}_{2}}$
D. $NaN{{H}_{2}}$

Answer 1

. In organic chemistry an alkyne is an unsaturated hydrocarbon containing at least one carbon—carbon triple bond. The simplest acyclic alkynes with only one triple bond and no other functional groups form a homologous series with the general chemical formula ${{C}_{n}}{{H}_{2n-2}}$.

Complete step by step answer:
1-butyne is generally a 4 carbon chain having $\equiv$ bond in between 1st and 2nd carbon shown as: $CH\equiv C-C{{H}_{2}}-C{{H}_{3}}$

2-butyne containing $\equiv$ bond in between 2nd and 3rd carbon atom as shown:
$C{{H}_{3}}-C\equiv C-C{{H}_{3}}$

Reagents which are able to distinguish between 1-butyne and 2-butyne are shown by the chemical reactions as follows:
$NaN{{H}_{2}}$can be used to identify between 1-butyne and 2-butyne as with 1-butyne it gives reaction while with other one it does not give reaction hence we say that option D is correct and reaction is discussed as follows:


So, the correct answer is “Option D”.

Note: Benzoyl chloride is mainly used in the production of peroxides and also useful in other areas like in the preparation of dyes, perfumes, resins etc and also plays an important role in pharmaceuticals and in benzoylation treatment.