Chemistry-
General
Easy
Question
The major product of the following reaction is
The correct answer is:
is a strong nucleophile and dimethyl formamide (DMF) is a highly polar aprotic solvent. Condition indicates that nucleophilic substitution (
takes place at 
benzylic place, stereochemically, it involves inversion of configuration.
Related Questions to study
Chemistry-
(A) would be:
(A) would be:
Chemistry-General
Chemistry-
R
on reaction with O2 gives:
R on reaction with O2 gives:
Chemistry-General
Physics-
In a resonance column method, resonance occurs at two successive level of 
= 30.7 cm and 
= 63.2 cm using a tuning fork of f = 512 Hz. What is the maximum error in measuring speed of sound using relations v = f
& = 2 (
In a resonance column method, resonance occurs at two successive level of = 30.7 cm and = 63.2 cm using a tuning fork of f = 512 Hz. What is the maximum error in measuring speed of sound using relations v = f & = 2 (
Physics-General
Physics-
The current voltage relation of diode is given by 
where the applied voltage V is in volts and the temperature T is in degree Kelvin. If a student makes an error measuring 
0.01 V while measuring the current of 5 mA at 300 K, what will be the error in the value of current in mA?
The current voltage relation of diode is given by where the applied voltage V is in volts and the temperature T is in degree Kelvin. If a student makes an error measuring 0.01 V while measuring the current of 5 mA at 300 K, what will be the error in the value of current in mA?
Physics-General
Chemistry-
(A) Phenetole on cleavage with HI yields phenol and ethyl iodide.
(R) Phenetole is a mixed aromatic ether.
(A) Phenetole on cleavage with HI yields phenol and ethyl iodide.
(R) Phenetole is a mixed aromatic ether.
Chemistry-General
Physics-
Internal micrometer is a measuring instrument used to measure internal diameter (ID) of a large cylinder bore with high accuracy. Construction is shown in figure. There is one fixed rod B (to the right in figure) and one moving rod A (to the left in figure). It is based on the principle of advancement of a screw when it is rotated in a nut with internal threads. Main scale reading can be directly seen on the hub which is fixed with respect to rod B. When the cap is rotated, rod A moves in or out depending on direction of rotation. The circular scale reading is seen by checking which division of circular scale coincides with the reference line.
This is to be multiplied by LC to get circular scale reading.
Least count = value of 1 circular scale division
Length of rod A is chosen to match the ID (PQ) to be measured. Zero error is checked by taking reading between standard blocks fixed at nominal value of ID to be measured. Zero error is positive if cap end is on the right side of the main scale and negative it is on the left side. During zero setting of the above instrument, the end of the cap is on left side of the zero of main scale (i.e. zero of main scale is not visible) and 41st division of circular scale coincides with the reference line, the zero error is-
Internal micrometer is a measuring instrument used to measure internal diameter (ID) of a large cylinder bore with high accuracy. Construction is shown in figure. There is one fixed rod B (to the right in figure) and one moving rod A (to the left in figure). It is based on the principle of advancement of a screw when it is rotated in a nut with internal threads. Main scale reading can be directly seen on the hub which is fixed with respect to rod B. When the cap is rotated, rod A moves in or out depending on direction of rotation. The circular scale reading is seen by checking which division of circular scale coincides with the reference line.
This is to be multiplied by LC to get circular scale reading.
Least count = value of 1 circular scale division
Length of rod A is chosen to match the ID (PQ) to be measured. Zero error is checked by taking reading between standard blocks fixed at nominal value of ID to be measured. Zero error is positive if cap end is on the right side of the main scale and negative it is on the left side. During zero setting of the above instrument, the end of the cap is on left side of the zero of main scale (i.e. zero of main scale is not visible) and 41st division of circular scale coincides with the reference line, the zero error is-
Physics-General
Physics-
Statement I: If the error in measurement of mass is 2 % and that in measurement of velocity is 5 %, then the error in measurement of kinetic energy is 6 %
Statement II: Error in kinetic energy is 
Statement I: If the error in measurement of mass is 2 % and that in measurement of velocity is 5 %, then the error in measurement of kinetic energy is 6 %
Statement II: Error in kinetic energy is
Physics-General
Chemistry-
In which of the following reactions, the product obtained is tert. butyl methyl ether?
In which of the following reactions, the product obtained is tert. butyl methyl ether?
Chemistry-General
Chemistry-
Among the following compounds, the strongest acid is:
Among the following compounds, the strongest acid is:
Chemistry-General
Chemistry-
(A) is:
(A) is:
Chemistry-General
Chemistry-
(A) is:
(A) is:
Chemistry-General
Chemistry-
Give the decreasing order of 
value of the following compounds
I) 
II) 
III) 
IV) 
Give the decreasing order of value of the following compounds
I)
II)
III)
IV)
Chemistry-General
Chemistry-
The decreasing order of 
reaction with 
/
is:
I) 
II) 
III) 
IV) 
The decreasing order of reaction with / is:
I)
II)
III)
IV)
Chemistry-General
Chemistry-
Which of the following will be obtained by keeping ether in contact with air for a long time?
Which of the following will be obtained by keeping ether in contact with air for a long time?
Chemistry-General
Chemistry-
Anisole on treatment with Br2/CS2 gives:
Anisole on treatment with Br2/CS2 gives:
Chemistry-General
