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How many of the following alkynes on tr...

How many of the following alkynes on treatment with dilute `H_2SO_4` in presence of `Hg SO_4` give a methyl ketone ?
`HC -= CH, CH_3C -= CH, CH_3CH_2 C -= CH, CH_3C -= C CH_3 , C_6H_5C -= CH, C_6H_5C -= C CH_3`.
`CH_3CH_2C -= C CH_2CH_3, CH_3CH_2CH_2C -= CH, C_6H_5CH(OH)C-=CH`

Text Solution

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The correct Answer is:
5
These are `CH_3 C -= CH , CH_3CH_2C -= CH , CH_3 C -= C CH_3, C_6H_5C -=CH , and CH_3 Ch_2 CH_2C -= CH . ` please note that
`C_6H_5 CH (OH)C -=CH` gives
`C_6H_5CH = CH - CHO and C_6H_5C -= C CH_3`
gives `C_6H_5COCH_2CH_3 `
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