Chemistry MCQs for NEET — Practice Questions with Answers

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Which carbide react with water to give propyne ?

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Explanation

$ Mg_2C_3 + 4 H_2O \rightarrow CH_3 - C \equiv CH + 2 Mg (OH)_2 $

Number of acidic hydrogen in 1-butyne are

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Explanation

Hydrogen attached to triplebonded carbon is acidic

Which reagent distinguish between But-1-yne and But-2-yne

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Explanation

with $ Ag( NH_3)_2 ]^+ 1- $ Alkyne will give reaction while 2- Alkyne will not give reaction

Point out the wrong statement in relation to the structure of Benzene.

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Which of the following when treated with super heated steam under pressure gives benzene?

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Explanation

When benzene sulphonic acid is treated with superheated steam under pressure, it undergoes hydrolysis to produce benzene. This is a known method for converting benzene sulphonic acid back to benzene.

Which of the following is not aromatic ?

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Explanation

A molecule is considered aromatic if it follows Hückel's rule, which states that a planar ring molecule will be aromatic if it has 4n+2 π-electrons, where n is a non-negative integer. Benzene, cyclopropenyl cation, and trophylium cation all follow Hückel's rule and are aromatic. However, the cyclopentadienyl cation has 4 π-electrons (which does not satisfy the 4n+2 rule where n=1) and is therefore not aromatic.

Benzene reacts with $ CH_3COCl$ in presence of $ AlCl_3 $ to give

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Explanation

When benzene reacts with acetyl chloride (CH₃COCl) in the presence of aluminum chloride (AlCl₃), it undergoes a Friedel-Crafts acylation reaction. This reaction introduces an acetyl group (COCH₃) into the benzene ring, resulting in the formation of acetophenone (C₆H₅COCH₃).

Nitration of Benzene is

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Explanation

Nitration, Sulphonation, Halogenation, Alkylation and Acylation of Benzene are Electro philic Substitation Reactions.

In the nitration of benzene the attack on ring is made by

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Explanation

$ NO_2 ^+ $ is electrophile

In the bromination of benzene which electrophilies attacks on ring ?

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Explanation

$ Br ^+ $ is electrophile

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