Chemistry-
General
Easy
Question
The reagent best suitable for the following transformation is 
- NH2NH2, KOH
- Zn/ Hg, HCl
- H2 / Ni
- NaBH4
The correct answer is: NH2NH2, KOH
Zn/Hg and HCl can also be used but will also dehydrate alcoholic group. Therefore NH2 NH2, KOH (1) is the best suitable reagent.
Related Questions to study
maths-
Statement-I : if z1 and z2 are two nonzero complex numbers such that 
then 
is π/2.
Statement-II : z1 and z2 are two complex numbers such that 
and is π/2 then 
Statement-I : if z1 and z2 are two nonzero complex numbers such that then is π/2.
Statement-II : z1 and z2 are two complex numbers such that and is π/2 then
maths-General
chemistry-
Consider the following reaction 
The product A is
Consider the following reaction The product A is
chemistry-General
chemistry-
Benzoylation of phenol in alkaline medium is known is known as
Benzoylation of phenol in alkaline medium is known is known as
chemistry-General
physics-
In the figure shown a current I1 is established in the long straight wire AB. Another wire CD carrying current 
is placed in the plane of the paper. The line joining the ends of this wire is perpendicular to the wire AB. The force on the wire CD is
In the figure shown a current I1 is established in the long straight wire AB. Another wire CD carrying current is placed in the plane of the paper. The line joining the ends of this wire is perpendicular to the wire AB. The force on the wire CD is
physics-General
physics-
A mass spectrometer is a device which select particle of equal mass. An iron with electric charge 
starts at rest from a source S and is accelerated through a potential difference V. It passes through a hole into a region of constant magnetic field 
perpendicular to the plane of the paper as shown in the figure. The particle is deflected by the magnetic field and emerges through the bottom hole at a distance d from the top hole. The mass of the particle is
A mass spectrometer is a device which select particle of equal mass. An iron with electric charge starts at rest from a source S and is accelerated through a potential difference V. It passes through a hole into a region of constant magnetic field perpendicular to the plane of the paper as shown in the figure. The particle is deflected by the magnetic field and emerges through the bottom hole at a distance d from the top hole. The mass of the particle is
physics-General
chemistry-
Find out B in the given reactions 
Find out B in the given reactions
chemistry-General
physics-
A current I flows a closed path in the horizontal plane of the circle as shown in the figure. The path consists of eight cars with alternating radii r and 2r. Each segment of arc subtends equal angle at the common centre P. The magnetic field produced by current path at point P is
A current I flows a closed path in the horizontal plane of the circle as shown in the figure. The path consists of eight cars with alternating radii r and 2r. Each segment of arc subtends equal angle at the common centre P. The magnetic field produced by current path at point P is
physics-General
physics-
Infinite number of straight wires each carrying current I are equally placed as shown in the figure. Adjacent wires have current in opposite direction. Net magnetic field at point P is
Infinite number of straight wires each carrying current I are equally placed as shown in the figure. Adjacent wires have current in opposite direction. Net magnetic field at point P is
physics-General
physics-
The charges 1, 2, 3 are moves in uniform transverse magnetic field then:–
The charges 1, 2, 3 are moves in uniform transverse magnetic field then:–
physics-General
chemistry-
Find out B in the given reactions 
Find out B in the given reactions
chemistry-General
physics-
A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to one of the sides of the loop and is in the plane of the loop. If steady current I is established in the wire as shown in the figure, the loop will
A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to one of the sides of the loop and is in the plane of the loop. If steady current I is established in the wire as shown in the figure, the loop will
physics-General
physics-
Figure shows a square current carrying loop ABCD of side 10 cm and current i = 10 A. The magnetic moment 
of the loop is
Figure shows a square current carrying loop ABCD of side 10 cm and current i = 10 A. The magnetic moment of the loop is
physics-General
physics-
A conducting rod of length l and mass m is moving down a smooth inclined plane of inclination qwith constant velocity v in fig. A current I is flowing in the conductor in a direction perpendicular to paper inwards. A vertically upward magnetic field B exists in space. Then magnitude of magnetic field B is
A conducting rod of length l and mass m is moving down a smooth inclined plane of inclination qwith constant velocity v in fig. A current I is flowing in the conductor in a direction perpendicular to paper inwards. A vertically upward magnetic field B exists in space. Then magnitude of magnetic field B is
physics-General
physics-
The square loop ABCD, carrying a current I, is placed in a uniform magnetic field B, as shown. The loop can rotate about the axis XX. The plane of the loop makes an angle 
with the direction of B. Through what angle will the loop rotate by itself before the torque on it becomes zero–
The square loop ABCD, carrying a current I, is placed in a uniform magnetic field B, as shown. The loop can rotate about the axis XX. The plane of the loop makes an angle with the direction of B. Through what angle will the loop rotate by itself before the torque on it becomes zero–
physics-General
chemistry-
In the above reaction Z is
In the above reaction Z is
chemistry-General
