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 Multiple Choice QuestionsMultiple Choice Questions

131.

The major product of the following reaction is,


A.

The reaction is a dehydrohalogenation E2-elimination reaction. Elimination takes place in single step and proceed by formation of transition state from anti position.


132.

Which of the following salts is the most basic in aqueous solution?

  • Pb(CH3COO)2

  • Al(CN)3

  • CH3COOK

  • FeCl3


C.

CH3COOK

CH3COOK is most basic among the given salts.

CH3COOK + H2O     CH3COOH weak Acid+ KOHStrong Base


133.

The correct increasing order of the acidic strength of acids, butyric acid (I), 2-chlorobutyric acid (II), 3-chlorobutyric acid (III) and 2, 2-dichlorobutyric acid (IV) is 

  • I < II < III < IV

  • III < II < IV < I

  • I < III < II < IV

  • III < I < II < IV


C.

I < III < II < IV

Among the given list of acids, the acidic strength increases on-

(i) Presence of electron with drawing group (i.e. - I group)

(ii) Closeness of electron withdrawing group from the -COOH group.

(iii) Number of electron with drawing groups (i.e. -I group)

Hence, the correct order among the given options will be I < III < II < IV


134.

Which of the following in Baeyer's reagent?

  • Alkaline KMnO4

  • Acidic K2Cr2O7

  • Alkaline Na2Cr2O7

  • MnO2


A.

Alkaline KMnO4

Alkaline KMnO4 is called Baeyer's reagent. It is used to test unsaturation in an organic compound, when it decolorises KMnO4.

CH2 = CH2H2O + OAlk. KMnO4 → C|OHH2-C|OHH2


135.

The condensation reaction between one equivalent of acetone and two equivalents of benzaldehyde in presence of dilute alkali leads to the formation of

  • Benzalacetophenone

  • Benzylideneacetone

  • Dibenzylideneacetone

  • Benzoic acid and acetic acid


C.

Dibenzylideneacetone

When two moles of benzaldehyde react with one mole of acetone. It shows aldol condensation as follows-

Therefore, among all the given options, option c is the correct one.