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DAT Organic Chemistry Review Practice Test. Which are more stable conformers - CORRECT ANSWER staggered What are the rate laws of SN2 and E2 reactions - CORRECT ANSWER rate= k [RX][Nu:-] rate depends on concentrations of alkyl halide and nucleophile What are the rate laws of SN1 and E...

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  • August 15, 2024
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  • 2024/2025
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DAT Organic Chemistry Review Practice
Test.

Which are more stable conformers - CORRECT ANSWER staggered



What are the rate laws of SN2 and E2 reactions - CORRECT ANSWER rate= k [RX][Nu:-]



rate depends on concentrations of alkyl halide and nucleophile



What are the rate laws of SN1 and E1 reactions - CORRECT ANSWER rate= k[RX]



rate only depends on the concentration of the alkyl halide



E2 elimination reactions must occur in bonds that are - CORRECT ANSWER coplanar or antiperiplanar




this type of reaction is stereospecific: one E or Z stereoisomer predominates



Most stable chair conformation - CORRECT ANSWER 1. convert to 2D structure following trans or cis
denotations



2. draw onto chair conformation



What mixtures can be separated by conventional physical methods - CORRECT ANSWER enantiomers



-identical chemical and physical properties except their ability to rotate plane polarized light by equal
amounts but in opposite directions

,Enantiomeric relationships with chair conformations - CORRECT ANSWER 1. draw the pairs into 2D
confirmations



down= dashed



up= shaded



What type of molecules exhibit optical activity - CORRECT ANSWER molecules with chiral centers



aldol condensation - CORRECT ANSWER The aldol reaction combines two carbonyl compounds to form a
new β-hydroxy carbonyl compound (aldol addition product). Further condensation (elimination of
water) results in an α,β-unsaturated carbonyl compound



β-hydroxy carbonyl - CORRECT ANSWER



α,β-unsaturated carbonyl - CORRECT ANSWER after H2O is removed



Acid attacks an epoxide - CORRECT ANSWER more substituted side



results in stereochemistry inversion



Cyclopentadiene - CORRECT ANSWER -conjugate base is aromatic



-planar conjugated system with 6 pi electrons



-produces stable free radical



-all atoms are spy hybridized



the more s character= - CORRECT ANSWER more acidic

, sp> sp2 > sp3



weakest base - CORRECT ANSWER electrons are least available



-resonance delocalization



Aromaticity rules - CORRECT ANSWER 1. cyclic or polycyclic



2. all the atoms in the ring must be spy or sp hybridized



3. the number of pi electrons in a ring must equal 4n + 2 = huckles rule



unsaturation formula - CORRECT ANSWER C- (H/2)- (X/2) + (N/2) + 1



SN1 reactions are most reactive towards - CORRECT ANSWER tertiary



Stability of alkenes - CORRECT ANSWER the greater the number of attached alkyl groups the more stable
the alkene will be



E>Z>but-1-ene



Tollens test - CORRECT ANSWER aldehydes



Iodoform test - CORRECT ANSWER ketones or aldehydes attached to a methyl group produce ionate



Br2/CCL4 - CORRECT ANSWER alkenes and alkynes react



red to clear solution

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