Compound (A) reacts with `[Cu(NH_3)_2]^(+)` and Tollens reagent, but after with alc: KOH it does not give the above test. Compound (A) is:

Options

A. (a) `Me--=-Me`
B. (b) `Me--=-H`
C.
D. (d) `Ph--=-H`

Answer

C

Explanation

Terminal alkyne containing four or more C atoms on reaction with alk. KOH isomerises to internal alkynes, which do not give all the tests mentioned. Although (b) and (d) are also terminal alkynes, they do not have sufficient C atoms to be converted to internal alkynes. So the answer is (c).