1,2−dibromopropane on treatment with X moles of NaNH<sub>2</sub> followed by treatment with ethyl bromide gave pentyne. The value of X is:

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Organic Chemistry
96

Organic Chemistry MCQ with Answers

96) 1,2−dibromopropane on treatment with X moles of NaNH₂ followed by treatment with ethyl bromide gave pentyne. The value of X is:

Answer is:

3

Organic Chemistry MCQ with Answers

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97) When acetylene reacts with arsenic trichloride in the presence of anhydrous aluminium chloride, it produces:

(a) β−chlorovinyldichloroarsine

(b) Lewisite

Both (a) and (b)

Answer is:

Both (a) and (b)

98) Which of the following will undergo metasubstitution on monochlorination?

Ethoxybenzene

Chlorobenzene

Ethylbenzoate

Phenol

Answer is:

Ethylbenzoate

99) The reaction of cis−2−butene with CH₂I₂ and Zn (Cu) to give cis−1,2−dimethyl cyclopropane is:

Stereospecific reaction

Enantiospecific reaction

Diastereoselective reaction

Regioselective reaction

Answer is:

Stereospecific reaction

Explanation:

The reaction results in the formation of one isomer, hence it is stereospecific.

100) 2−methylbutane on reacting with bromine in the presence of sunlight gives mainly:

1−bromo−3−methylbutane

2−bromo−3−methylbutane

2−bromo−2−methylbutane

1−bromo−2−methylbutane

Answer is:

2−bromo−2−methylbutane

Organic Chemistry MCQ with Answers

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96) 1,2−dibromopropane on treatment with X moles of NaNH2 followed by treatment with ethyl bromide gave pentyne. The value of X is:

3

Organic Chemistry MCQ with Answers

Related Organic Chemistry MCQ with Answers

97) When acetylene reacts with arsenic trichloride in the presence of anhydrous aluminium chloride, it produces:

Both (a) and (b)

98) Which of the following will undergo metasubstitution on monochlorination?

Ethylbenzoate

99) The reaction of cis−2−butene with CH2I2 and Zn (Cu) to give cis−1,2−dimethyl cyclopropane is:

Stereospecific reaction

100) 2−methylbutane on reacting with bromine in the presence of sunlight gives mainly:

2−bromo−2−methylbutane

Organic Chemistry MCQ with Answers

96) 1,2−dibromopropane on treatment with X moles of NaNH₂ followed by treatment with ethyl bromide gave pentyne. The value of X is:

99) The reaction of cis−2−butene with CH₂I₂ and Zn (Cu) to give cis−1,2−dimethyl cyclopropane is: