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Alcohol, phenol & ether MCQs for NEET — Chemistry Questions with Answers

Practice free Alcohol, phenol & ether (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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A compound with molecular formula C4H10O3 is converted by the action of acetyl chloride to a compound with molar mass 190. The original compound has: 

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Explanation

ROH + CH3COCl ------- ROCOCH3 + HCl 

    M                                   (M + 42)

 Acylation of each OH group results in an increase of molecular mass of 42. In the given problem molecular mass of the compound increases by 84 on acylation. Therefore, the compound has two OH groups.

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An organic compound A reacts with sodium metal and forms B. On heating with conc. H2SO4, A gives diethyl ether. So A and B are                                                              [AFMC 1998]

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Explanation

Na reacts with alcohol and acid .. but here all options r alcohol

thy form di ethyl ether , it means alcohol has 2 carbon , so its ethanol

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Reaction of phenol with chloroform in the presence of dilute sodium hydroxide finally introduces, which one of the following functional group?

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Explanation

This is Reimer-Tiemann reaction.

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Ethylene oxide when treated with Grignard reagent yields :

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Explanation

When ethylene oxide is treated with a Grignard reagent (RMgX), it undergoes nucleophilic addition to form a primary alcohol. The Grignard reagent attacks the electrophilic carbon of the epoxide ring, and the magnesium salt is then hydrolyzed to yield the primary alcohol.

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Consider the following reaction,

Phenol→Zn-dustX→Anhy.AlCl3CH3ClY→Alk.KMnO4Z 

The product Z is                            

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Explanation

The given reaction sequence involves the dehydroxylation of phenol to benzene using Zn dust, followed by chlorination of benzene with anhydrous AlCl3 to form chlorobenzene, and finally oxidation of chlorobenzene with alkaline KMnO4 to give benzoic acid.

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What is formed when a primary alcohol undergoes catalytic dehydrogenation?

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Explanation

When a primary alcohol undergoes catalytic dehydrogenation, it forms an aldehyde. This reaction involves the removal of two hydrogen atoms from the alcohol group, resulting in the formation of a carbonyl group, which is characteristic of aldehydes.

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Formaldehyde is not used in:

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Explanation

(d) In rest all HCHO is used.

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The nitration of benzene with fuming HNO3 will give:

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Explanation

(a) Trinitrobenzene is an explosive compound formed during nitration of C6H6 with fuming HNO3.

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Commonly used antiseptic 'Dettol' is a mixture of

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Explanation

(d) Dettol is an antiseptic. It is a mixture of chloroxylenol and terpineol in a suitable solvent.

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PhOH →NaOHMe2SO4 P, P is

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