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S_N1 reaction is feasible in:

1.
2.
3.
4.

Subtopic: Mechanism of Reactions | Chemical Properties |

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Q2:

Assertion (A):	Isopropyl chloride is more reactive than CH₃Br in S_N2 reactions.
Reason (R):	S_N2reactions are always accompanied by inversion of configuration.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.

Subtopic: Mechanism of Reactions | Chemical Properties |

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Q3:

Case Study
A halogen is more electronegative than carbon. Consequently, the two atoms do not share their bonding electrons equally, because a partial negative charge is formed on halogen and a partial positive charge on the carbon to which it is bonded. It is the polar-carbon halogen bond that causes alkyl halides to undergo substitution reactions.
There are two important mechanisms for the substitution reaction:

1.	S_N1: The carbon-halogen bond breaks heterolytically without any assistance from the nucleophile, forming a carbocation. The carbocation- an electrophile-then reacts with the nucleophile to form the substitution product
2.	S_N2: A nucleophile is attracted to the partially positively charged carbon (an electrophile).As the nucleophile approaches the carbon and forms a new bond, the carbon-halogen bond breaks heterolytically (the halogen takes both of the bonding electrons)

Which solvent, from the following, favors the S_N2 mechanism?

1.	Non-polar solvent	2.	Polar protic solvent
3.	Polar aprotic solvent	4.	All of the above

Subtopic: Mechanism of Reactions | Chemical Properties |

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Q4:

Consider the reaction
CH₃ CH₂ CH₂ Br + NaCN - CH₃ CH₂ CH₂ CN + NaBr
This reaction will be the fastest in

1. Ethanol

2. Methanol

3. N, N'-dimethylformamide (DMF)

4. water

Subtopic: Mechanism of Reactions | Chemical Properties |

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NEET - 2016

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Q5:

Match the column:

Column-I (Name reaction)		Column -I (Representation of reaction)
(P)	Finkelstein reaction	(I)
(Q)	Lucas reaction	(II)
(R)	Wurtz reaction	(III)
(S)	Gattermann-Koch reaction	(IV)

1. P-IV, Q-III, R-II, S-I
2. P-I, Q-II, R-III, S-IV
3. P-II, Q-III, R-I, S-IV
4. P-III, Q-II, R-I, S-IV

Subtopic: Mechanism of Reactions |

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Q6:

The most reactive compound for S_N2 reaction among the following is:

1.		2.
3.		4.

Subtopic: Mechanism of Reactions |

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Q7:

In the following pairs of halogen compounds, which compound undergoes faster S_N1 reaction?

The correct option is:

1.
2.
3.
4.

Subtopic: Mechanism of Reactions |

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Level 1: 80%+

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Q8:

Choose the incorrect statement regarding S_N2 reactions:

1.	As the concentration of nucleophiles increases, the reaction rate increases.
2.	Both the attack of the nucleophile and the departure of the leaving group occur simultaneously.
3.	Inversion of configuration occurs on asymmetric centers because the nucleophile attacks from the backside of the leaving group.
4.	The S_N2 mechanism is predominant in tertiary alkyl halides.