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 Multiple Choice QuestionsMultiple Choice Questions

31.

For the sequence of reactions

A C2H5MgI B H2O/ H+ ter-pentyl alcohol

The compound A in the sequence is

  • 2-butanone

  • acetaldehyde

  • acetone

  • propanal


C.

acetone


32.

In Dow's process, the starting raw material is

  • phenol

  • chlorobenzene

  • aniline

  • diazobenzene


B.

chlorobenzene

In Dow's process, sodium phenoxide is obtained by the reaction of chlorobenzene with NaOH at 573 - 623 K and 200 atm, which on acid hydrolysis forms phenol.


33.

The compound from which formic acid cannot be prepared is

  • methyl alcohol

  • carbon monoxide + NaOH

  • glycerol

  • methyl magnesium bromide


D.

methyl magnesium bromide

Formic acid (HCOOH) cannot be prepared from methyl magnesium bromide (CH,MgBr) while from all other reagents, it is obtained as 

(a) CH3OH O HCHO O HCOOH

(b) CO + NaOH → HCOONa NaHSO4 HCOOH + Na2SO4

(c) Glycerol + Oxalic acid H2O383 K HCOOH + glycerol


34.

The alcohol that produces turbidity immediately with ZnCl3/conc. HCl at room temperature

  • 1-hydroxy butane

  • 2-hydroxy butane

  • 2-hydroxy-2-methyl propane

  • 1-hydroxy-2-methyl propane


C.

2-hydroxy-2-methyl propane

Mixture of anhydrous ZnCl2, and cone. HCl is known as Lucas reagent. Lucas test is used for the distinction between primary, secondary and tertiary alcohols. The tertiary alcohol reacts immediately with Lucas reagent producing turbidity. The secondary alcohol gives turbidity within 5-10 min and primary alcohol do not give turbidity at all at room temperature. In the given alternates, 2-hydroxy-2-methyl propane is 3° alcohol, so it is more reactive.


35.

Ether and alcohol are ...... isomers.

  • chain

  • position

  • functional

  • not isomers


C.

functional

General formula for both ethers and alcohols is CnH2n+2 but the functional group in ethers is -O- and in alcohols is -OH. Therefore, they are functional isomers.


36.

The correct order of boiling point for primary (1 °), secondary (2°) and tertiary (3°) alcohols is

  • 1 ° >2° > 3°

  • 3° >2° > 1

  • 2° > 1 ° > 3°

  • 2° >3° > 1


A.

1 ° >2° > 3°

Alcohols with same molecular weight are expected to have almost same boiling point however two more factors other than molecular weight are important, they are namely H-bonding and surface area of molecule. Both these factors are least in 3° alcohols and maximum in 1° alcohols. Hence, 3° alcohols have least boiling point while 1° alcohols have maximum boiling point.


37.

The major product obtained on the interaction of phenol with sodium hydroxide and carbon dioxide is

  • Benzoic acid

  • Salicylaldehyde

  • Salicylic acid

  • Phthalic acid


C.

Salicylic acid

Kolbe – Schmidt reaction is

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38.

Which alcohol of molecular formula C4H9OH cannot be obtained by the reduction of carbonyl compound ?

  • 2-methyl propan-1-ol

  • 2-methyl propan-2-ol

  • butanol

  • butan-2-ol


B.

2-methyl propan-2-ol

The structures of possible alcohols having formula C4H9OH are as

Among these, 2-methyl propan-2-ol cannot be prepared by the reduction of carbonyl compounds.


39.

In the following reaction,

Ethyl alcohol(in excess) + H+(from H2SO4) 413 K Product

the product is

  • ethene

  • ethyl hydrogen sulphate

  • diethyl ether

  • acetylene


C.

diethyl ether

In the above given reaction, the product is diethyl ether.

If temperature is high (i.e. 463 K), ethene is obtained.


40.

Which of the following on heating with aqueous KOH, produces acetaldehyde?

  • CH3COCl

  • CH3CH2Cl

  • CH2Cl CH2Cl

  • CH2Cl CH2Cl


D.

CH2Cl CH2Cl

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