Compound (A) does not react with Tollens or Grignard reagent, but after treatment with `NaNH_2`, it gives the above test. The compound (A) is/are:

Options

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

Answer

A, C, D

Explanation

Internal alkyne on reaction with `NaNH_2` isomerises to terminal alkyne, which gives all the tests mentioned. Here (a), (c) and (d) are internal alkynes.