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 Multiple Choice QuestionsMultiple Choice Questions

1.

The correct order of increasing acid strength of the compounds

  • b < d < a < c

  • d < a < c < b

  • d < a < b < c

  • d < a < b < c


C.

d < a < b < c

313 Views

2.

The increasing order of the rate of HCN addition to compounds A – D is
(A) HCHO
(B) CH3COCH3
(C) PhCOCH3
(D) PhCOPh

  • A < B < C < D

  • D < B < C < A

  • D < C < B < A

  • D < C < B < A


C.

D < C < B < A

244 Views

3.

Among the following the one that gives positive iodoform test upon reaction with I2 and NaOH is 

  • CH3CH2CH(OH)CH2CH3

  • C6H5CH2CH2OH


D.

448 Views

4.

p-cresol reacts with chloroform in the alkaline medium to give the compound A which adds hydrogen cyanide to form, the compound B. The latter on acidic hydrolysis gives chiral carboxylic acid. The structure of the carboxylic acid is


B.

455 Views

5.

The best reagent to convert pent -3- en-2-ol into pent -3-en-2-one is

  • Acidic permanganate

  • Acidic dichromate

  • Chromic anhydride in glacial acetic acid

  • Chromic anhydride in glacial acetic acid


C.

Chromic anhydride in glacial acetic acid

472 Views

6.

The number of mesa forms in the following compound is

HOOC·CH(CH3)·CH(OH)·CHCl·CH(OH)CH(CH3)·COOH

  • 3

  • 4

  • 8

  • 16


B.

4

Number of mesa structures in compound having odd number of chiral carbon atoms and symmetrical molecule = 2n2-12

Given,     n = 2

 Number of meso forms = 25/2- 1/2 = 22 =4


7.

The compound 'C' in the following reaction is

C7H83Cl2/ A Br2/ Fe B  Zn / HCl C

  • o-bromotoluene

  • m-bromotoluene

  • p-bromotoluene

  • 3-bromo-2, 4, 6-trichlorotoluene


B.

m-bromotoluene

Key Idea:  Side chain hydrogen atoms are substituted in presence of light or heat. Ring hydrogens are substituted in presence of Lewis acid.

           


8.

Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as

  • a Schiff’s base

  • an enamine

  • an imine

  • an imine


B.

an enamine

231 Views

9.

Identify the wrong statement. 

  • Salicylic acid is a monobasic acid

  • Methyl salicylate is an ester

  • Salicylic acid gives violet colour with neutral ferric chloride as well as brisk effervescence with sodium bicarbonate

  • Methyl salicylate does not occur in mineral oils


D.

Methyl salicylate does not occur in mineral oils

 

Methyl salicylate (oil of wintergreen or wintergreen oil) is an organic ester naturally produced by many species of plants, particularly wintergreens. The compound was first extracted and isolated from plant species Gaultheria procumbens in 1843. It can be manufactured synthetically and it used as a fragrance, in foods, beverages, and liniments. It forms a colorless to yellow or reddish liquid and exhibits a characteristic odor and taste of wintergreen. For acute joint and muscular pain, methyl salicylate is used as a rubefacient and analgesic in deep heating liniments. It is used as a flavoring agent in chewing gums and mints in small concentrations and added as antiseptic in mouthwash solutions.

 


10.

Benzaldehyde on refluxing with aqueous alcoholic KCN produce

  • cyanobenzene

  • cyanohydrin

  • benzoyl cyanide

  • benzoin


D.

benzoin

Key Idea: Benzaldehyde on reaction with ale KCN undergo condensation reaction to give benzoin.

2C6H5CHO KCN (alc) C6H5-CHOH-CO-C6H5Benzoin