Q1) Which of the following alkene isomers has the HIGHEST Heat of Combustion A)
ID: 549926 • Letter: Q
Question
Q1) Which of the following alkene isomers has the HIGHEST Heat of Combustion A) B) D) 02) Which of the following pairs of C-H bonds (shown in boxes) are Anti to (B) H hich of the following conformations has the MOST SIGNIFICANT 13 diaxial repulsion? C(CH3 CH3 CH D) A) B) me for 2-luoro-2-methylpropane? i "functional class" A) 1-methylpropyl fluoride c) 2-methylisopropyl fluoride Q4) What is the B) 2-methylpropyl fluoride D) 1,1-dimethylethyl fluoride Q5) The alkene classification for 1-ethyleyclopentene is A) Mono-substituted C) Tri-substituted B) Di-substituted D) Tetra-substituted Q6) Which of the following is a reasonable transition state structure for the rate reaction between CH,CH:-OH and HCI that forms the product CH,CH CI termining step in the CI H osExplanation / Answer
1. Option A, since lesser is the stability of alkene (less substituted - Saytzev's rule) greater is the heat of combustion and vice-versa.
2. Option D, since they are 180 degrees of separation to each other.
3. Option D, since methyl groups at 1,3 positions will experience diaxial interactions.
4. Option B, longest chain is prop. Hence 2-methyl propylfluoride.
5. Option C, trisubstituted alkene
6. Option A, since it is an example for SN2 reaction, hence single step and in that both leaving of H2O and attack of Cl occurs in single step, ie., in Option A.
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