NEET (NTA)-National Eligibility cum Entrance Test (Medical) Chemistry: Questions 887 - 890 of 1258

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Passage

Read the passage given below and answer the questions that follows:

Acetylene and other terminal alkynes (1-alkynes) are weakly acidic in character. The acetylenic hydrogen of such alkynes can be replaced by copper (1) and silver (I) ions. They react with ammonical solutions of cuprous chloride and silver nitrate to form the corresponding copper and silver alkynides.

This reaction can be used to distinguish between 2-alkynes and 1-alkynes. 1-Alkynes will give this test while 2-alkynes, will not give this test.

Question number: 887 (1 of 3 Based on Passage) Show Passage

» Hydrocarbons » Alkynes » Acidic Character

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MCQ▾

Question

Which of the following acid is dibasic?

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 888 (2 of 3 Based on Passage) Show Passage

» Hydrocarbons » Alkynes » Addition of Hydrogen, Halogens, Water and Hydrogen Halides

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MCQ▾

Question

Acetylene gives -

Choices

Choice (4) Response

a.

Red ppt

b.

White ppt with Cu2Cl2 and red ppt with AgNO3

c.

White ppt

d.

White ppt with AgNO3 and red ppt with Cu2Cl2

Question number: 889 (3 of 3 Based on Passage) Show Passage

» Hydrocarbons » Alkynes » Acidic Character

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MCQ▾

Question

Acetylenic hydrocarbons are acidic because-

Choices

Choice (4) Response

a.

Acetylene has only one hydrogen atom at each carbon atom

b.

Acetylene belongs to the class of alkynes with formula CnH2n-2

c.

Acetylene contains least number of hydrogen atoms among the possible

d.

Sigma electron density of C — H bond in acetylene is nearer a carbon, which has 50 % s-character

Question number: 890

» Hydrocarbons » Aromatic Hydrocarbons » Mechanism of Electrophilic Substitution

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Appeared in Year: 2016

MCQ▾

Question

A given nitrogen-containing aromatic compound A reacts with Sn/HCl, followed by HNO2 to give an unstable compound B. B, on treatment with phenol, forms a beautiful colored compound C with the molecular formula C12H10N2O. The structure of compound A is:

Choices

Choice (4) Response

a.

The structure of compound A: Choice A

The Structure of Compound a: Choice A

The structure of compound A

b.

The structure of compound A: Choice B

The Structure of Compound a: Choice B

The structure of compound A

c.

The structure of compound A: Choice C

The Structure of Compound a: Choice C

The structure of compound A

d.

The structure of compound A: Choice D

The Structure of Compound a: Choice D

The structure of compound A