Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to a gaseous hydrocarbon containing less than four carbon atoms. (A) is

  • CH ≡ CH

  • H2C = CH2

  • CH4

  • CH3-CH3


C.

CH4


42.

Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively


D.

Haloform reaction is shown by compound having


43.

Which of the following carbocations is expected to be most stable?


C.

-NO2 group is meta-directing group, therefore,

Less stable due to more e- withdrawing effect of -NO2

More stable due to the less e-withdrawing effect of NO2


44.

In the reaction,

The electrophile involved is

  • Dichloromethyl cation (C+HCl2)

  • Formyl cation (C+HO)

  • Dichlorocarbene (:CCl2)

  • Dichloromethyl anion (C-HCl2)


C.

Dichlorocarbene (:CCl2)

Reimer-Tiemann reaction. The electrophile formed is :CCl2 (Dichlorocarbene) according to the following reaction

CHCl3 + OH- CCl3  + H2OCCl3      :CCl2 Electrophile+ Cl-


45.

Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their

  • Formation of intramolecular H-bonding

  • Formation of intermolecular H-bonding

  • Formation of intermolecular H-bonding

  • More extensive association of carboxylic acid via Vander Waals force of attraction


C.

Formation of intermolecular H-bonding

Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. This is due to the more extensive association through intermolecular H-bonding.