An organic compound 'X' having molecular formula $C_{5} H_{10} O$ yields phenyl hydrazone and gives negative response to the Iodoform test and Tollen's test. It produces n-pentane on reduction. 'X' could be:

3-pentanone

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n-amyl alcohol

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pentanal

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2-pentanone

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Solution

The correct option is A 3-pentanone
An organic compound 'X' having molecular formula $C_{5} H_{10} O$ yields phenyl hydrazone. This indicates presence of carbonyl group.
It gives negative response to the Iodoform test. It indicates absence of methyl keto group.
Hence, n-amyl alcohol and 2-pentanone are ruled out.
It gives negative response to the Tollen's test. It indicates absence of aldehyde group.
Hence, pentanal is ruled out.
It produces n-pentane on reduction. This indicates presence of 5-carbon backbone.
'X' could be 3-pentanone.

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An organic compound 'X' having molecular formula C5H10O yields phenyl hydrazone and gives negative response to the Iodoform test and Tollen's test. It produces n-pentane on reduction. 'X' could be:

An organic compound 'X' having molecular formula $C_{5} H_{10} O$ yields phenyl hydrazone and gives negative response to the Iodoform test and Tollen's test. It produces n-pentane on reduction. 'X' could be: