Hello Student,

CH3MgBr fall in the category of grignard reagents(RMgX)

CH3MgBr on reaction with compounds having atleast once acidic hydrogen will evolve methane/CH4 gas.

1) CH3MgBr + R'OH --------> CH4 + R'O-Mg-Br

2) CH3MgBr + R'NH2  -------->    CH4 + R'NH-Mg-Br

3)  CH3MgBr + R'-CCH(Alkyne)   -------->  CH4 + R'-CC-Mg-X

4) CHMgBr + HOH --------> CH4 + OH-Mg-X

Replace the R' group with any alkane and you will easily get 10 or more compounds which evolve methane gas on reaction with CH3-Mg-BR. In Methane that is evolve CH3- comes from the grignard reagent which reacts with the acidic hydrogen to form methane.