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 Multiple Choice QuestionsMultiple Choice Questions

11.

The compound formed as a result of oxidation of ethylbenzene by KMnO4 is

  • benzophenone

  • acetophenone

  • benzoic acid

  • benzoic acid


C.

benzoic acid

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12.

Reaction of acids with alcohols is also known as

  • esterification

  • saponification

  • alkalisation

  • None of these


A.

esterification

Acids react with alcohols give ester, this process is known as esterification.

RCOOHacid + R'OH alcohol RCOOR'ester


13.

The aldol condensation of CH3 -CHO results is the formation of

  • CH3-CH2OH + CH3OH


A.

Two molecules of acetaldehyde gives aldol on aldol condensation

2CH3CHOacetaldehyde OH CH3-OHCH-CH2-CHOaldol


14.

CH3-CH(OC2H5)-CH2-CH2-CH3 the IUPAC name is 

  • 2-ethoxy pentane

  • 4-ethoxy pentane

  • pentyl-ethyl ether

  • 2-pentoxy ethane


A.

2-ethoxy pentane

CH31-CH2(OC2H5) -CH23-CH24-CH352- ethoxy pentane


15.

(CH2CO)2O + RMgX H2O?

  • ROOCH(CH2)COOR

  • RCOCH2CH2COCH

  • RCOOR

  • RCOOH


B.

RCOCH2CH2COCH


16.

The catalyst used in Rosenmund reaction is :

  • Zn/ Hg

  • Pd / BaSO4

  • Raney Ni

  • Na in ethanol


B.

Pd / BaSO4

In the Rosenmund's reaction the acid chlorides are converted to corresponding aldehydes by catalytic reaction. This reaction is carried in the presence of palladium deposited over barium sulphate.

CH3-CO-Cl  +  H2  Pd, BaSO4   CH3CHO   +  HClacetyl chloride                                acetaldehyde


17.

Give the IUPAC name for

H3C-CH2-CO-H2C-CH2-CO-OCH3

  • ethyl-4-oxoheptanoate

  • methyl-4-oxoheptanoate

  • ethyl-4-oxohexanoate

  • methyl-4-oxohexanoate


D.

methyl-4-oxohexanoate

H2C6-CH25-CO4-CH23-CH22-CO1-OCH3           Methyl-4-oxohexanoate


18.

Aldol condensation is given by

  • trimethylacetaldehyde

  • acetaldehyde

  • benzaldehyde

  • formaldehyde


B.

acetaldehyde

Aldol condensation is given by acetaldehyde due to the presence of α-hydrogen atom.

CH3CHO + H·CH2CHO Dil NaOH CH3- CHOH -CH2-CHO                                                                    aldol


19.

Which does not react with Fehling's solution?

  • CH3CHO

  • C6H5CHO

  • C6H12O6

  • HCOOH


B.

C6H5CHO

Aromatic aldehyde ie, C6H5CHO are not able to reduce Fehling's solution but it gives Cannizaro's reaction with alkali.


20.

The weakest acid amongst the following is :

  • ClCH2COOH

  • HCOOH

  • FCH2CH2COOH

  • CH2(I)COOH


D.

CH2(I)COOH

The strength of carboxylic acid depends upon the nature of the electron withdrawing halogen atom. Greater the electron withdrawing influence of the halogen atom stronger will be the acid. The electron withdrawing effect of the halogen decreases as:

                   F > Cl > Br > I

 Hence, CH2(I) · COOH is the weakest acid among these.