Chemistry-
General
Easy
Question
Which of the following are stereospecific reactions?
- (I), (II)
- (I), (II), (III)
- (III), (IV), (V)
- All
The correct answer is: All
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Chemistry-
Consider the following reactions:
Which of the following are stereospecific reactions?
Consider the following reactions:
Which of the following are stereospecific reactions?
Chemistry-General
Chemistry-
In elimination reaction, the major product is either Saytzeff (more-substituted alkene) or Hofmann product (less-substituted alkene) depending on the nature of the substrate and the nature of the base
Which statement is correct about the reactions?
In elimination reaction, the major product is either Saytzeff (more-substituted alkene) or Hofmann product (less-substituted alkene) depending on the nature of the substrate and the nature of the base
Which statement is correct about the reactions?
Chemistry-General
Chemistry-
Which statement is wrong in the formation of (B) from (A)
Which statement is wrong in the formation of (B) from (A)
Chemistry-General
Chemistry-
The rate of 
reaction depends on the effectiveness of the nucleophile in ejecting the leaving group. Nucleophilicity is the affinity for C atom, while basicity is the affinity for proton
In both cases, a new bond is formed. If a new bond is formed between the anion and proton, the species acts as a base. If a new bond is formed between the anion and C atom, the species acts as nucleophile
Which of the following statements is wrong?
The rate of reaction depends on the effectiveness of the nucleophile in ejecting the leaving group. Nucleophilicity is the affinity for C atom, while basicity is the affinity for proton
In both cases, a new bond is formed. If a new bond is formed between the anion and proton, the species acts as a base. If a new bond is formed between the anion and C atom, the species acts as nucleophile
Which of the following statements is wrong?
Chemistry-General
Chemistry-
Statement 1:Addition of bromine to 
-2-butene yields meso-2,3-dibromo butane
Statement 2:Bromine addition to an alkene is an electrophilic addition
Statement 1:Addition of bromine to -2-butene yields meso-2,3-dibromo butane
Statement 2:Bromine addition to an alkene is an electrophilic addition
Chemistry-General
Physics-
Microwaves from a transmitter are directed normally towards a plane reflector. A detector moves along the normal to the reflector. Between positions of 14 successive maxima, the detector travels a distance 0.14 m. If the velocity of light is 3 
108 m/s, find the frequency of the transmitter –
Microwaves from a transmitter are directed normally towards a plane reflector. A detector moves along the normal to the reflector. Between positions of 14 successive maxima, the detector travels a distance 0.14 m. If the velocity of light is 3 108 m/s, find the frequency of the transmitter –
Physics-General
Physics-
Radio waves coming at 
to vertical are received by a radar after reflection from a nearby water surface & directly. What can be height of antenna from water surface so that it records a maximum intensity (a maxima). (wavelength = 
) (Assume phase changes by 
after reflection)
Radio waves coming at to vertical are received by a radar after reflection from a nearby water surface & directly. What can be height of antenna from water surface so that it records a maximum intensity (a maxima). (wavelength = ) (Assume phase changes by after reflection)
Physics-General
Physics-
Equation of a stationary and a travelling waves are as follows y1 = a sin kx cos 
t and y2 = a sin (t – kx). The phase difference between two points
in the standing wave (y1 ) andis f2 in travelling wave (y2 ) then ratio
Equation of a stationary and a travelling waves are as follows y1 = a sin kx cos t and y2 = a sin (t – kx). The phase difference between two pointsin the standing wave (y1 ) andis f2 in travelling wave (y2 ) then ratio
Physics-General
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Earthquakes generate sound waves inside Earth. Unlike a gas, Earth can experience both transverse (S) and longitudinal (P) sound waves. Typically, the speed of S waves is about 4 km/s. A seismograph records P and S waves from an earthquake. The first P waves arrive 3.0 min before the first S wave (figure). Assuming the waves travel in a straight line, how far away does the earthquake occur ? (Yearth = 12.8 1010 pa, rearth = 2000 kg/m3 )
Earthquakes generate sound waves inside Earth. Unlike a gas, Earth can experience both transverse (S) and longitudinal (P) sound waves. Typically, the speed of S waves is about 4 km/s. A seismograph records P and S waves from an earthquake. The first P waves arrive 3.0 min before the first S wave (figure). Assuming the waves travel in a straight line, how far away does the earthquake occur ? (Yearth = 12.8 1010 pa, rearth = 2000 kg/m3 )
Physics-General
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Figure shows a stretched string of length L and pipes of length L, 2L, L/2 and L/2 in options (A), (B), (C) and (D) respectively. The string’s tension is adjusted until the speed of waves on the string equals the speed of sound waves in the air. The fundamental mode of oscillation is then set up on the string. In which pipe will the sound produced by the string cause resonance ?
Figure shows a stretched string of length L and pipes of length L, 2L, L/2 and L/2 in options (A), (B), (C) and (D) respectively. The string’s tension is adjusted until the speed of waves on the string equals the speed of sound waves in the air. The fundamental mode of oscillation is then set up on the string. In which pipe will the sound produced by the string cause resonance ?
Physics-General
Physics-
For a sound wave travelling towards +x direction, sinusoidal longitudinal displacement x at a certain time is given as a function of x. If Bulk modulus of air is B = 5 x 105 N/m2 , the variation of pressure excess will be
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Physics-General
Physics-
A 100 m long rod of density 10.0 x 104 kg/m3 and having Young’s modulus Y = 1011 Pa, is clamped at one end. It is hammered at the other free end. The longitudinal pulse goes to right end, gets reflected and again returns to the left end. How much time, the pulse take to go back to initial point.
A 100 m long rod of density 10.0 x 104 kg/m3 and having Young’s modulus Y = 1011 Pa, is clamped at one end. It is hammered at the other free end. The longitudinal pulse goes to right end, gets reflected and again returns to the left end. How much time, the pulse take to go back to initial point.
Physics-General
Physics-
S1 and S2 are two coherent sources of sound separated by distance 100.25 , where is the wave length of sound. S1 leads S2 in phase by /4. A and B are two points on the line joining S1 and S2 as shown in figure. The ratio of amplitudes of source S1 and S2 are in ratio 1:2. The ratio of intensity at A to that of B 
is
S1 and S2 are two coherent sources of sound separated by distance 100.25 , where is the wave length of sound. S1 leads S2 in phase by /4. A and B are two points on the line joining S1 and S2 as shown in figure. The ratio of amplitudes of source S1 and S2 are in ratio 1:2. The ratio of intensity at A to that of B is
Physics-General
Physics-
When beats are produced by two progressive waves of nearly the same frequency, which one of the following is correct?
When beats are produced by two progressive waves of nearly the same frequency, which one of the following is correct?
Physics-General
Physics-
S1 & S2 are two coherent sources of sound having no initial phase difference. The velocity of sound is 330 m/s. No minima will be formed on the line passing through S2 and perpendicular to the line joining S1 and S2 , if the frequency of both the sources is :
S1 & S2 are two coherent sources of sound having no initial phase difference. The velocity of sound is 330 m/s. No minima will be formed on the line passing through S2 and perpendicular to the line joining S1 and S2 , if the frequency of both the sources is :
Physics-General
