Substitution Reactions | MCQs
A. Single displacement reaction
B. Decomposition reaction
C. Addition reaction
D. None of these
Explanation
In this reaction, element C displaces B from compound AB , forming A + BC .
Such reactions are classified as single displacement or single replacement reactions.
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مندرجہ ذیل میں سے کون سا الیکٹرو فائل نہیں ہے؟
A. None of these
B. C₂H₅OCH₃
C. [CH₃]₃C⁺
D. AlCl₃
Explanation
An electrophile is a species that seeks electrons and can accept an electron pair.
C₂H₅OCH₃ (Ethyl methyl ether) is not an electrophile.
Because it lacks an electron-deficient center and does not readily accept electron pairs.
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مندرجہ ذیل میں سے کون نیوکلیوفائل نہیں ہے؟
A. None of these
B. NH₃
C. AlCl₃
D. HSO₃⁻
Explanation
AlCl₃ (Aluminum chloride) is not a nucleophile because it is an electron-deficient Lewis acid . This meaning it accepts electrons instead of donating them. Nucleophiles are species that donate electron pairs. While AlCl₃ acts as an electrophile in chemical reactions. Show/Hide Explanation
جب کسی نیوکلیوفائل کا نیوکلیوفیلیسیٹی ، کسی ایٹم میں شامل ہوتا ہے تو توقع سے زیادہ پایا جاتا ہے _____ اثر کے نام سے جانا جاتا ہے؟
A. Beta
B. Gamma
C. Alpha
D. None of these
Explanation
When the nucleophilicity of a nucleophile, joined to an atom, is found to be greater than expected, it is referred to as the beta effect. The beta effect occurs due to the inductive or hyperconjugative influence from neighboring atoms. Show/Hide Explanation
A. CH3Br
B. CH3I
C. CH3Cl
D. None of these
Explanation
SN2 reactions favor weaker C-X bonds, and iodine (I) has the weakest bond due to its large atomic size. CH₃I reacts fastest because iodide is a better leaving group than Br, Cl, or F. Show/Hide Explanation
الکائل ہالائیڈز کے متبادل اور خاتمے سے متعلق درست بیان کی نشاندہی کریں؟
A. Strong bases causes substitution in preference to elimination
B. Role of leaving groups in elimination is similar to substitution
C. Decrease in temperature will favor elimination more than substitution
D. Substitution is favored more than elimination by decreasing solvent polarity
Explanation
In both substitution and elimination reactions, the leaving group plays a similar role by departing from the alkyl halide , enabling the reaction to proceed.
Better leaving groups increase the likelihood of both types of reactions occurring.
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