CHE302 Q2V8 201 su base and a tertiary alkyl halide substrates tend to favor whi
ID: 705249 • Letter: C
Question
CHE302 Q2V8 201 su base and a tertiary alkyl halide substrates tend to favor which of the follewing mechanisms? Serial No 6 Strong (a) Sl (b) El 7 Which of the following is the fastest Su2 reaction? (c) E2 (d) Su2 0% (d) All of them have equal rate of reaction What effect would doubling the concentration of the nucleophile have on the rate of an Su2 reaction? (a) The rate will be unchanged. (b) The rate will be halved (c) The rate will be doubled. (d) The rate will be quadrupled. 9 Which of the following is a polar aprotic solvent? (b) H2O 10 Draw a fully labelled energy diagram for the following Sl reaction correctly reflecting the relative activation energy of the rate determining step(s). ?? ?? Ci CHJOHExplanation / Answer
Answer -
6.Tertiary alkyl halide and strong base should undergo SN1 mechanism. It forms 3 degree carbocation.
7.so as atoms get bigger from F to I, bonds get longer, so weaker and react faster.
Hence Iodopropane and Cl- react faster among them
Correct option is A.
8.That is, the SN2 occurs in one step, and both the nucleophile and substrate are involved in the rate determining step. Therefore the rate is dependent on both the concentration of substrate and that of the nucleophile.
Hence, rate of SN2 reaction is doubled.
9. polar Aprotic solvents may have hydrogens on them somewhere, but they lack O-H or N-H bonds, and therefore cannot hydrogen bond with themselves.
Option C is DMSO ,which is polar aprotc solvent.