Question

what ia chromyl chloride

Answer 1

Chromyl chloride is a chemical compound with the formula CrO2Cl2. 
Reaction of Toluene with chromyl chloride forms a chromium complex which on hydrolysis gives Benzaldehyde

Answer 2

Chromyl chloride is a chemical compound with the formula CrO₂Cl₂. This compound is a hygroscopic dark red liquid. The molecule is tetrahedral, like most commonly encountered chromium(VI) derivative chromate, [CrO₄]2−. In terms of physical properties and structure, it resembles SO₂Cl₂. Wikipedia