18. Which of the following is the best leaving group? A) HO B)F C D) Br E)I 19.

Question

18. Which of the following is the best leaving group? A) HO B)F C D) Br E)I 19. Which of the following is an aprotic solvent? A) CH3CH20H B) CH3CH2CH2NH2 C) CH3CH20CH2CH3 D) CH3CH2NHCH3 E) CH3COH 20. Draw the product of the following SN2 reaction. Br Which alkyl halide reacts the fastest in an SN1 reaction? A) 2-chloro-2-methylpropane B) 2-chlorobutane C) 1-chlorobutane D) chloromethane 21. Which of the following are the elimination products of the reaction shown below? A) CH3CH2BrtH+O- B) HOCH2CH2Br C) CH3CH2OH + Br D) CH2-CH2+ Br+H20 E) CH2-CHBr+H20 22. What is the major product of the following E2 reaction? CH; OCH CH,-CH-CH-CH:CH, Br A)

Explanation / Answer

18)

Answer: E

I- is best leaving group because of its larger size.

Larger size means lesser electron density and hence I- is most stable

19)

Answer: C

In all other there is H attached to electronegative element that makes them protic

in A, H is attached to O

in C, H is attached to N

in D, H is attached to N

in E, H is attached to O

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