Which of the following is the most stable alkene? Which of the following will gi

Question

Which of the following is the most stable alkene? Which of the following will give the highest percentage of elimination when treated with NaOCH_2CH_3 in ethanol? A) CH3CH2 Br B) CH3 CH2CH2B C) CH3CH2CH2CH2Br D) 2-bromobutane E) 2-bromo-2-methylbutane Which compound undergoes acid-catalyzed dehydration the fastest? What alkyne is the best starting material for the synthesis of the 2-butanone, H3C-(O) -CH2-CH3, via acid-catalyzed hydration? A) ethyne B) propyne c) 2 - butyne d) 1 - butyne D) 2 -pentyne Which of the following descriptions best matches the sequence of events that occurs in the reaction below? A) an H abstraction by a base, followed by an intramolecular S_N2 B) an intramolecular S_N2, followed by an H abstraction by a base C) formation of a carbocation by ionizing the C-Br bond, followed intramolecular S_N^1, followed by an H abstraction by a base C) formation of a carbocation by ionizing the C-Br bond, followed by H abstraction by a base leading to elimination E) none of the above Which of the following cannot be made by the reduction of an aldehyde or ketone with NaBH4 in methanol A) butan-1-ol B) butan-2-ol C) 2-methyl-propan-2-ol D) 2 methyl propan-1-ol Identify the best product for the following reaction.

Explanation / Answer

1. The most stable alken is because it is having highest substitution.

2.Compound e will give highest percentage of elimination because it will form highest substituted (most stable) alkene.

3. Compound a will undergo fastest dehydration because it will form highest substituted (most stable) alkene.

4. Compound c

5. Option A is the correct option

6. Tertiary alcohols can not be prepared by the reduction of aldehydes or ketones. So, Option C is the correct one.

7.

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