NEET – 2020 – NEETmcqs

Identify Z in the following reaction:

$CH_3CH_2CH=CH_2 \xrightarrow[H_2O,\ H_2O_2,\ OH^-]{B_2H_6} Z$

$CH_3CH_2CH_2CH_2OH$
$CH_3CH_2 \ C \ HCH_3 \\~~~~~~~~~~~~~~~~~~| \\~~~~~~~~~~~~~~~~OH$
$CH_3CH_2CH_2CHO$
$CH_3CH_2CH_2CH_3$

Explanation:

Hint: The reaction is Hydroboration-oxidation

The hydroboration oxidation reaction is an organic chemical reaction that is employed for the conversion of alkenes into

alcohol. This is done via a two-step process which includes a hydroboration step and an oxidation step.

Hydroboration oxidation reaction mechanism can be considered as an anti-Markovnikov

a reaction. In this reaction, the hydroxyl group attaches to the carbon which is less substituted. The reaction is as follows:

$C H_{3} - C H_{2} - C H = C H_{2} \underset{2 .}{\to}$ $C H_{3} - C H_{2} - C H = C H_{2} \to 2 .$ $H_{2} O,$ $H_{2} O,$ $H_{2} O_{2}, O H 1 .$ $H_{2} O_{2}, O H 1 .$ $B H_{3} . T H F C H_{3} C H_{2} C H_{2} C H_{2}$ $B H_{3} . T H F C H_{3} C H_{2} C H_{2} C H_{2}$ $O H$ $O H$

(Hydroboration-oxidation)

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Exam: NEET – 2020

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NEET - 2020

Phenols: Preparation & Properties

The most reactive compound among the following for electrophilic aromatic substitution is:

Exam: NEET – 2020

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NEET - 2020

Phenols: Preparation & Properties

The most acidic compound among the following is:

Exam: NEET – 2020

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NEET - 2020

Ethers: Preparation & Properties, Uses

Which of the following is produced when anisole reacts with HI?

Explanation:

Hint: Hydrolysis of phenolic ether takes place

Explanation:

The reaction follows partially $S_{N} 2$ $S_{N} 2$ reaction mechanism in which iodide ion attacks at the alkyl group with less steric hindrance and weak $C - O$ bond. The reaction is as follows: