How many of the following alkynes on treatment with dilute H2SO4 in presence of HgSO4 give a methyl ketone?HC ≡CH, CH3C≡ CH, CH3CH2C ≡CH, CH3C ≡CCH3, C6H5C≡ CH,C6H5C ≡CCH3, CH3CH2C≡ CCH2CH3, CH3CH2CH2C≡ CH

These are – CH3C ≡CH, CH3CH2C ≡CH, CH3C ≡CCH3, C6H5C ≡CH, and CH3CH2CH2C ≡CH,please note that C6H5CH(OH)C≡ CH gives C6H5CH = CH−CHO and C6H5C≡ CCH3 gives C6H5COCH2CH3

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How many of the following alkynes on treatment with dilute $H_{2} S O_{4}$ in presence of $H g S O_{4}$ give a methyl ketone?
$H C \equiv C H, C H_{3} C \equiv C H, C H_{3} C H_{2} C \equiv C H, C H_{3} C \equiv C C H_{3}, C_{6} H_{5} C \equiv C H,$
$C_{6} H_{5} C \equiv C C H_{3}, C H_{3} C H_{2} C \equiv C C H_{2} C H_{3}, C H_{3} C H_{2} C H_{2} C \equiv C H$

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answer is 5.

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Detailed Solution

These are – $C H_{3} C \equiv C H,$ $C H_{3} C H_{2} C \equiv C H,$ $C H_{3} C \equiv C C H_{3},$ $C_{6} H_{5} C \equiv C H,$ and $C H_{3} C H_{2} C H_{2} C \equiv C H,$ please note that $C_{6} H_{5} C H (O H) C \equiv C H$ gives $C_{6} H_{5} C H = C H - C H O$ and $C_{6} H_{5} C \equiv C C H_{3}$ gives $C_{6} H_{5} C O C H_{2} C H_{3}$

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