NEET – 2018 – NEETmcqs

The compound A on treatment with Na gives B, and with PCl₅ gives C. B and C react together to give diethyl ether.

A, B and C are, respectively:

$C_{2}H_{5}OH,$ $C_{2}H_{6},$ $C_{2}H_{5}Cl$
$C_{2}H_{5}OH,$ $C_{2}H_{5}Cl,$ $C_{2}H_{5}ONa$
$C_{2}H_{5}Cl,$ $C_{2}H_{6},$ $C_{2}H_{5}OH$
$C_{2}H_{5}OH,$ $C_{2}H_{5}ONa$ $,C_{2}H_{5}Cl$

Exam: NEET – 2018

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NEET - 2018

Compound A, $C_{8}H_{10}O$ is found to react with NaOI (produced by reacting Y with NaOH) and yield a yellow precipitate with a characteristic smell. A and Y are respectively?

Explanation:

Hint: If the compound contains ${CH}_{3} - \overset{\overset{OH}{I}}{C} -$ ${CH}_{3} - C \overset{OH}{I} -$ unit then it will give an iodoform test.

In iodoform reaction, I₂, and NaOH, or NaOI reacts with alcohol which contains ${CH}_{3} - \overset{\overset{OH}{I}}{C} -$ ${CH}_{3} - C \overset{OH}{I} -$ unit. When alcohol reacts with I₂, and NaOH, or NaOI then sodium carboxylate and yellow ppt of CHI₃ is obtained. The reaction is as follows:

#89170

Exam: NEET – 2018

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NEET - 2018