In the reaction,
$H - C \equiv CH \to_{(ii) {CH}_{3} {CH}_{2} Br}^{(i) {NaNH}_{2} / liq . {NH}_{3}} X \to_{(ii) {CH}_{3} {CH}_{2} Br}^{(i) {NaNH}_{2} / liq . {NH}_{3}} Y$

X and Y are:

1. X = 2 –Butyne; Y = 3 –Hexyne
2. X = 2 – Butyne; Y = 2-Hexyne
3. X = 1-Butyne; Y = 2-Hexyne
4. X = 1 – Butyne; Y = 3 – Hexyne

Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |

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Q50:

The compound

C_{7} H_{8}

undergoes the following reactions :

C_{7} H_{8} \overset{3 {Cl}_{2} / ∆}{\to} A \overset{{Br}_{2} / Fe}{\to} B \overset{Zn / HCl}{\to}

The product 'C' is

1. m–Bromotoluene
2. o–Bromotoluene
3. 3–Bromo–2,4,6–trichlorotoluene
4. p–Bromotoluene

Subtopic: Aromatic Hydrocarbons - Benzene - Structure, Preparation & Chemical Reactions |

NEET - 2018

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Q51:

Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is

1.

CH \equiv CH

2.

{CH}_{2} = {CH}_{2}

3.

{CH}_{3} - {CH}_{3}

4.

{CH}_{4}

Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |

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Q52:

The compound that will react most readily with gaseous bromine has the formula is-

1. $C_{3} H_{6}$

2. $C_{2} H_{2}$

3. $C_{4} H_{10}$

4. $C_{2} H_{4}$

Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |

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Q53:

In the given reaction

The product P is

1.

2.

3.

4.

Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |

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Q54:

In which of the following molecules, all atoms are coplanar?

1.

2.

3.

4.

Subtopic: Hybridisation |

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Q55:

Which of the following can be used as the halide component for Friedel-Crafts reaction?

1. Chlorobenzene

2. Bromobenzene

3. Chloroethene

4. Isopropyl chloride

Subtopic: Aromatic Hydrocarbons - Benzene - Structure, Preparation & Chemical Reactions |

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Q56:

Predict the correct intermediate and product in the following reaction:

H_{3} C - C \equiv CH \to_{{HgSO}_{4}}^{H_{2} O, H_{2} {SO}_{4}} \underset{(A)}{Intermediate} \to \underset{(B)}{Product}

1.

A : H_{3} C - \underset{OH}{\underset{|}{C}} = {CH}_{2}; B : H_{3} C - \underset{{SO}_{4}}{\underset{|}{C}} = {CH}_{2}

2.

A : H_{3} C - \underset{O}{\underset{| |}{C}} - {CH}_{3}; B : H_{3} C - C \equiv CH

3.

A : H_{3} C - \overset{OH}{\overset{|}{C}} = {CH}_{2}; B : H_{3} C - \overset{O}{\overset{| |}{C}} - {CH}_{3}

4.

A : H_{3} C - \underset{S O_{4}}{\underset{|}{C}} = {CH}_{2}; B : H_{3} C - \underset{O}{\underset{| |}{C}} - {CH}_{3}

Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |

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Q57:

The oxidation of benzene by V₂O₅ in the presence of air produces

1. benzoic anhydride 2. maleic anhydride

3. benzoic acid 4. benzaldehyde

Subtopic: Aromatic Hydrocarbons - Benzene - Structure, Preparation & Chemical Reactions |

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NEET - 2015

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Q58:

$(A) \overset{N a / N H_{3} (l)}{\to} (B) \overset{M C B P A}{\to} (C)$

Compound (C) in above sequence of reaction is:

1. 2.

3. 4.

Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |

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In the reaction, H-C≡CH →ii CH3CH2Bri NaNH2/liq.NH3 X →ii CH3CH2Bri NaNH2/liq.NH3 Y X and Y are: 1. X = 2 –Butyne; Y = 3 –Hexyne 2. X = 2 – Butyne; Y = 2-Hexyne 3. X = 1-Butyne; Y = 2-Hexyne 4. X = 1 – Butyne; Y = 3 – Hexyne

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