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Given reason for the following : (i) G...

Given reason for the following :
(i) Glucose does not give 2, 4 D.N.P. test or Schiff's reagent test.
(ii) Amino acids have high melting points and are water soluble.

Text Solution

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(i) these are the characteristic reactions of aldehydic (-CHO) group. This group is not free in glucose and is involved in the formation of cyclic structure (`delta` - oxide ring structure). Therefore, glucose does not react with both these reagents.
(ii) Amino acids have dipolar structures and have strong dipole-dipole interaction in their molecules. These have therefore, high melting points. These are water soluble as both the amino `(-NH_(2))` and carboxyl (-COOH) groups are involved in hydrogen bonding with the `H_(2)O` molecules.
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Amino acids have high melting points and are soluble in water.

Assign reasons for the following : (i) lonic bond is non-following: (ii) lonic bond is non-directional (iii) lonic compounds have high melting points.

Knowledge Check

  • Which of the following will not give D.N.P test ?

    A
    `CH_(3) - CHO`
    B
    `CH_(3) - CO - CH_(3)`
    C
    `CH_(3) -O-CH_(3)`
    D

  • Assertion: Glucose does not gives 2,4-DNP test. Reason: Glucose exists in cyclic hemiacetal form

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reson are true but reason is not the correct explanation of assertion.
    C
    if assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Whcih of following give positive test with 2,4-DNP?

    A
    `CH_(3) - overset(O)overset(||)(C ) - H_(3)`
    B
    `CH_(3) - overset(O)overset(||)(C ) - CH_(3)`
    C
    `CH_(3) - overset(O)overset(||)(C ) - OH`
    D
    `CH_(3)-CH_(2)-OH`

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