Class 11
Dheeraj Singh asked • 4 minutes agoPassage IUnlike alkenes, alkynes undergo nucleophilic addition as well as electrophilic addition as :
Q. Nucleophilic addition can occur on alkynes that bear strong electron withdrawing group such as — CF3 on the triple bond. Predict product of the following reaction :
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Passage I
Unlike alkenes, alkynes undergo nucleophilic addition as well as electrophilic addition as :
Q. Nucleophilic addition can occur on alkynes that bear strong electron withdrawing group such as — CF3 on the triple bond. Predict product of the following reaction :
Somya Agarwal Agarwal asked • 12 minutes agoTemperature of gas increases during adiabatic compression?
Sanika Shaikh Shaikh asked • 2 hours agoIf the source of light used in a Young's Double Slit Experiment is changed from red to blue, then- a)The fringes will become brighter
- b)Consecutive fringes will come closer
- c)The number of maxima formed on the screen increases
- d)The central bright fringe will become a dark fringe.
Correct answer is option 'B,C'. Can you explain this answer?
If the source of light used in a Young's Double Slit Experiment is changed from red to blue, then
a)
The fringes will become brighter
b)
Consecutive fringes will come closer
c)
The number of maxima formed on the screen increases
d)
The central bright fringe will become a dark fringe.
Sujata Tanwar asked • 3 hours agoDirection (Q. No. 9) This sectionis based on statement I and Statement II. Select the correct answer from the code given below.Q. Statement I :Every endothermic reaction is spontaneous if TΔS > ΔH.Statement II : Sign of ΔG is the true criterion for deciding spontaneity of a reaction.- a)Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
- b)Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
- c)Statement I is correct but Statement II is incorrect
- d)Statement II is correct but Statement I is incorrect
Correct answer is option 'B'. Can you explain this answer?
Direction (Q. No. 9) This sectionis based on statement I and Statement II. Select the correct answer from the code given below.
Q.
Statement I :Every endothermic reaction is spontaneous if TΔS > ΔH.
Statement II : Sign of ΔG is the true criterion for deciding spontaneity of a reaction.
a)
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
b)
Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
c)
Statement I is correct but Statement II is incorrect
d)
Statement II is correct but Statement I is incorrect
Raja Khan Rana asked • 5 hours agoDirection (Q. Nos. 20 and 21) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.Statement I : In reductive ozonolysis, dimethylsulphide is better reducing reagent than Zn- H2O.
Statement II : (CH3)2S brings about homogeneous catalysis.- a)Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
- b)Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I
- c)Statement I is correct but Statement II is incorrect
- d)Statement II is correct but Statement I is incorrect
Correct answer is option 'C'. Can you explain this answer?
Direction (Q. Nos. 20 and 21) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.
Statement I : In reductive ozonolysis, dimethylsulphide is better reducing reagent than Zn- H2O.
Statement II : (CH3)2S brings about homogeneous catalysis.
Statement II : (CH3)2S brings about homogeneous catalysis.
a)
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
b)
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I
c)
Statement I is correct but Statement II is incorrect
d)
Statement II is correct but Statement I is incorrect
Anirban Saha asked • 6 hours ago If q is instantaneous angle which the line joining the particle and the centre of the loop makes with the vertical, then identify the correct statement(s) related to the normal reaction N between the block and the surface- a)The maximum value N occurs at q = 0
- b)The minimum value of N occurs at N = p for H > 5R/2
- c)The value of N becomes negative for p/2 < q < 3p/2
- d)The value of N becomes zero only when q ³ p/2
Correct answer is option 'A,B,D'. Can you explain this answer?
If q is instantaneous angle which the line joining the particle and the centre of the loop makes with the vertical, then identify the correct statement(s) related to the normal reaction N between the block and the surface
a)
The maximum value N occurs at q = 0
b)
The minimum value of N occurs at N = p for H > 5R/2
c)
The value of N becomes negative for p/2 < q < 3p/2
d)
The value of N becomes zero only when q ³ p/2
Shravani Rawool asked • 7 hours agoTwo balls are dropped to the ground from different heights.One ball is dropped 2 s after the other but they bothstrike the ground at the same time. If the first ball takes5 s to reach the ground, then the difference in initialheights is (g = 10 ms-2)- a)20 m
- b)80 m
- c)170 m
- d)40 m
- e)160 m
Correct answer is option 'B'. Can you explain this answer?
Two balls are dropped to the ground from different heights.One ball is dropped 2 s after the other but they bothstrike the ground at the same time. If the first ball takes5 s to reach the ground, then the difference in initialheights is (g = 10 ms-2)
a)
20 m
b)
80 m
c)
170 m
d)
40 m
e)
160 m
Mirza Maris Ali asked • 7 hours agoWhat is/are true about chlorination of toluene?- a)In presence of light, benzyl chloride is formed
- b)In presence of AICI3, ortho and para chlorotoluenes are formed
- c)Once a chlorine atom is introduced into benzene ring, further chlorination at benzene ring becomes difficult compared to first chlorination
- d)Chlorination of toluene in presence of AICI3 is more difficult than benzene
Correct answer is option 'A,B,C'. Can you explain this answer?
What is/are true about chlorination of toluene?
a)
In presence of light, benzyl chloride is formed
b)
In presence of AICI3, ortho and para chlorotoluenes are formed
c)
Once a chlorine atom is introduced into benzene ring, further chlorination at benzene ring becomes difficult compared to first chlorination
d)
Chlorination of toluene in presence of AICI3 is more difficult than benzene
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