Which of the following statement(s) is/a...

Which of the following statement(s) is/are correct?

A

Calcium carbide on hydrolysis gives acetylene gas

B

Tropylium cation is aromatic in nature

C

Acidity of the carbon-hydrogen bond decreases gas? in the order `CH =-CHgt H_2C = CH_2,gtCH_3- CH_3`

D

All of these

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