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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.
An organic compound with molecular formula exhibits optical isomerism but not geometrical isomerism. It also gives a positive iodoform test. Which of the following could be the compound?
Heptan-2-one
3-methylhex-3-en-2-one
2,4-dimethylpentan-3-one
4-methylhexan-3-one
Arrange the following groups in decreasing order of their -M effect: -NO2, -CN, -COOH, -COOR
-NO2 > -CN > -COOH > -COOR
-CN > -NO2 > -COOH > -COOR
-COOH > -COOR > -NO2 > -CN
-COOR > -COOH > -CN > -NO2
The correct order of stability of the following resonating structures of formate ion (HCOO-) is:
I > II > III
I = II > III
III > II > I
II > I > III
Which of the following is NOT a consequence of hyperconjugation?
Stability of carbocations
Shortening of C-C single bond adjacent to a double bond
Stability of alkenes
Bond bending
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
Which of the following intermediates is least likely to rearrange?
Secondary carbocation
Primary carbocation
Triphenylmethyl carbocation
Secondary alkyl free radical
Which of the following reactions proceeds through a carbocation intermediate and involves rearrangement?
Addition of HBr to ethene
Reaction of 2-bromopropane with sodium methoxide
Addition of HCl to 3-methylbut-1-ene
Reaction of 1-chlorobutane with aqueous sodium hydroxide
Which of the following reactions proceeds via a carbocation intermediate and exhibits racemization?
SN2 reaction of a primary alkyl halide
E2 reaction of a secondary alkyl halide
SN1 reaction of a chiral tertiary alkyl halide
Addition of HBr to an alkene in the presence of peroxides
An unknown organic compound (A) with molecular formula C₄H₈ reacts with ozone followed by zinc and water to give two molecules of acetaldehyde. Compound (A) on reaction with hot alkaline KMnO₄ gives:
Butanoic acid
Two molecules of acetic acid
Butan-2-one
Butane-1,4-diol
