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NEET Questions / Chemistry / Organic Chemistry: Some basic principles and techniques
Which of the following statements is INCORRECT regarding the isomerism exhibited by the compound with the formula ?
It can exhibit chain isomerism.
It can exhibit position isomerism.
It can exhibit geometrical isomerism.
It can exhibit both geometrical and optical isomerism simultaneously.
A compound with the molecular formula shows optical activity but no geometrical isomerism. Which of the following could be the compound?
Hex-3-en-2-one
2,3-dimethylbut-2-enoic acid
Ethyl 2-methylpropanoate
2-hydroxy-4-methylpentanoic acid
Which of the following compounds exhibits both tautomerism and geometrical isomerism?
But-2-enal
Pent-2,4-dione
3-oxopent-2-enal
2-methylbut-2-enal
A highly impure sample of benzoic acid is contaminated with naphthalene. Which of the following techniques would be LEAST effective for purifying the benzoic acid?
Simple distillation
Sublimation followed by recrystallization
Recrystallization from hot water
Treatment with sodium bicarbonate followed by acidification
A student attempts to purify a mixture of aniline and nitrobenzene by steam distillation. Which compound will distill over first, and why?
Nitrobenzene, due to its higher molecular weight
Aniline, due to its lower boiling point and formation of less extensive hydrogen bonds with water compared to nitrobenzene
Both will distill over simultaneously as they form an azeotropic mixture
Nitrobenzene, because it is less volatile than aniline
You are purifying a sample containing p-nitroaniline and o-nitroaniline. Exploiting the difference in their basicity, which method would be most effective for separating these isomers?
Fractional distillation
Simple recrystallization from water
Dissolving the mixture in dilute HCl and then selectively precipitating p-nitroaniline by careful neutralization with dilute NaOH
Steam distillation
A mixture of benzoic acid and benzamide is dissolved in diethyl ether. Which of the following would be the MOST efficient method to separate the two compounds?
Fractional distillation
Recrystallization from hot water
Extract the ethereal solution with aqueous sodium bicarbonate, then acidify the aqueous layer to recover benzoic acid; evaporate the ether to recover benzamide.
Steam distillation
Which of the following is the correct IUPAC name for the compound with the formula ?
2,4-Dimethyl-3-ethylhexane
3-Ethyl-2,4-dimethylhexane
2,3-Diethyl-4-methylpentane
3,3-Diethyl-2-methylpentane
What is the IUPAC name of the following bicyclic compound: a bicyclo[2.2.1]heptane with a methyl substituent at the bridgehead carbon connecting the two five-membered rings?
2-Methylbicyclo[2.2.1]heptane
7-Methylbicyclo[2.2.1]heptane
1-Methylbicyclo[2.2.1]heptane
Methylbicyclo[2.2.1]heptane
