Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Which of the statement about 'Denaturation' given below are correct?
Statements,

A) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.
B) Denaturation leads to the conversion of double strand of DNA into single strand.
C) Denaturation affects primary structure which gets distroyed.

  • (B) and (C)

  • (A) and (C)

  • (A) and (B)

  • (A) and (B)


B.

(A) and (C)

Which of the statement about 'Denaturation' given below are correct?
Statements,

A) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.
B) Denaturation leads to the conversion of double strand of DNA into single strand.
C) Denaturation affects primary structure which gets distroyed.

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22.

Consider the reactions


space left parenthesis straight i right parenthesis space left parenthesis CH subscript 3 right parenthesis subscript 2 CH minus space CH subscript 2 space minus space CH subscript 2 space Br space rightwards arrow with straight C subscript 2 straight O subscript 5 OH on top space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 OC subscript 2 straight H subscript 5 space plus space Br to the power of minus

left parenthesis ii right parenthesis space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 Br rightwards arrow with straight C subscript 2 straight H subscript 5 straight O to the power of minus on top space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 OC subscript 2 straight H subscript 5 space plus Br to the power of minus

The mechanisms of reactions (i) and (ii) are respectively

  • SN1 and SN2

  • SN1 and SN1

  • SN2 and SN2

  • SN2 and SN2


A.

SN1 and SN2

Consider the reactions


space left parenthesis straight i right parenthesis space left parenthesis CH subscript 3 right parenthesis subscript 2 CH minus space CH subscript 2 space minus space CH subscript 2 space Br space rightwards arrow with straight C subscript 2 straight O subscript 5 OH on top space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 OC subscript 2 straight H subscript 5 space plus space Br to the power of minus

left parenthesis ii right parenthesis space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 Br rightwards arrow with straight C subscript 2 straight H subscript 5 straight O to the power of minus on top space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 OC subscript 2 straight H subscript 5 space plus Br to the power of minus

The mechanisms of reactions (i) and (ii) are respectively

281 Views

23.

Which of the following complex compounds will exhibit highest paramagnetic behaviour ?

At. no. : Ti = 22, Cr = 24, Co = 27, Zn = 30

  • [Ti(NH3)6]3+

  • [Cr(NH3)6]3+

  • [Co(NH3)6]3+

  • [Co(NH3)6]3+


B.

[Cr(NH3)6]3+

Which of the following complex compounds will exhibit highest paramagnetic behaviour ?

At. no. : Ti = 22, Cr = 24, Co = 27, Zn = 30

925 Views

24.

The IUPAC name of the following compound

  • trans - 2- chloro - 3 - iodo - 2 - pentene

  • cis - 3- iodo - 4-  chloro - 3- pentene

  • trans - 3- iodo - 4- chloro - 3- pentene

  • trans - 3- iodo - 4- chloro - 3- pentene


A.

trans - 2- chloro - 3 - iodo - 2 - pentene

The IUPAC name of the following compound

325 Views

25.

Match the compounds given in the list I with List II and select the suitable option using the code given below.

 

List I

 

List II

A.

Benzaldehyde

1.

Phenolphtalein

B.

Phthalic anhydride

2.

Benzoin Condensation

C.

Phenyl benzoate

3.

Oil of wintergreen

D.

Methyl salicylate

4.

Fries rearrangement

  • A
    B
    C
    D
    4
    1
    3
    2
  • A
    B C D
    4 2 3 1
  • A
    B C D
    2 3 4 1
  • A
    B C D
    2 3 4 1

D.

A
B C D
2 3 4 1

Match the compounds given in the list I with List II and select the suitable option using the code given below.

 

List I

 

List II

A.

Benzaldehyde

1.

Phenolphtalein

B.

Phthalic anhydride

2.

Benzoin Condensation

C.

Phenyl benzoate

3.

Oil of wintergreen

D.

Methyl salicylate

4.

Fries rearrangement

377 Views

26.

Which of the following is not a fat soluble vitamin?

  • Vitamin- B - complex

  • Vitamin -D

  • Vitamin -E

  • Vitamin -E


A.

Vitamin- B - complex

Which of the following is not a fat soluble vitamin?

268 Views

27.

Which of the following compound is most basic?


B.

Which of the following compound is most basic?

481 Views

28.

A organic compound 'A' on treatment with NH3 gives 'B' which on heating gives 'C', 'C" when treated with Br2 in the presence of KOH produces ethylamine. Compound ' A' is

  • CH3COOH

  • CH3CH2CH2COOH

  • CH3(CH3)CHCOOH

  • CH3(CH3)CHCOOH


D.

CH3(CH3)CHCOOH

A organic compound 'A' on treatment with NH3 gives 'B' which on heating gives 'C', 'C" when treated with Br2 in the presence of KOH produces ethylamine. Compound ' A' is

572 Views

29.

Which of the following compounds undergoes nucleophilic substitution reaction most easily?


A.

Which of the following compounds undergoes nucleophilic substitution reaction most easily?

638 Views

30.

The order of reactivity of phenyl magnesium bromide (phMgBr) with the following compounds.


  • III > II> I

  • II > I > III

  • I > III > II

  • I > III > II


D.

I > III > II

The order of reactivity of phenyl magnesium bromide (phMgBr) with the following compounds.


968 Views