Select the reagents that reduce nitriles to primary amines:
A. (i) LiAlH4; (ii) H2O
B. Sn + HCl
C. H2/Ni
D. Na(Hg)/C2H5OH
E. Br2/aq. NaOH
Choose the correct answer from the options given below:
1. A, B and C only
2. A, C and D only
3. A, D and E only
4. B, D and E only
A. (i) LiAlH4; (ii) H2O
B. Sn + HCl
C. H2/Ni
D. Na(Hg)/C2H5OH
E. Br2/aq. NaOH
Choose the correct answer from the options given below:
1. A, B and C only
2. A, C and D only
3. A, D and E only
4. B, D and E only
Subtopic: Amines - Preparation & Properties | Cyanides & Isocyanides |
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Identify the incorrect statement from the following :
| 1. | Carbon has the ability to form pπ-pπ multiple bond with itself. |
| 2. | \(\mathrm{EC}_3\) (E = B and Al) is a monomer when E = B and a dimer when E = Al. |
| 3. | Oxygen exhibits only 2 oxidation states. |
| 4. | The order of catenation property of Group 14 elements is C>> Si > Ge ≈ Sn. |
Subtopic: Carbon Family - Preparations, Properties & Uses | Structure & Properties of Allotropes of C |
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Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because :
| 1. | Its nearest inert gas is Radon. |
| 2. | After losing one more electron, it acquires \(4f^{14}\) electronic configuration. |
| 3. | Its atomic number is 61. |
| 4. | After losing one more electron, it acquires \(4f^0\) electronic configuration. |
Subtopic: d-Block Elements- Properties & Uses | f-Block Elements- Properties & Uses |
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During Lassaigne's test, the elements present in an organic compound are converted from:
| 1. | Covalent form to covalent form |
| 2. | Ionic form to ionic form |
| 3. | Covalent form to ionic form |
| 4. | Ionic form to covalent form |
Subtopic: Qualitative Analysis of Organic Compounds |
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The number of hydrogen atoms present in 5.4 g of urea is :
(Given : Molar mass of urea : 60 g mol-1, NA : 6.022 × 1023 particles mol-1)
1. 2.168 × 1023
2. 2.168 × 1022
3. 1.084 × 1022
4. 1.084 × 1023
(Given : Molar mass of urea : 60 g mol-1, NA : 6.022 × 1023 particles mol-1)
1. 2.168 × 1023
2. 2.168 × 1022
3. 1.084 × 1022
4. 1.084 × 1023
Subtopic: Moles, Atoms & Electrons |
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Subtopic: Structural Isomers | Conformational Isomers |
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Identify the incorrect statement from the following :
| 1. | \(P(C_2H_5)_3\) and \(As(C_6H_5)_3\) form dπ-dπ bond with transition metals. |
| 2. | Nitrogen can form dπ-pπ bond with oxygen. |
| 3. | Nitrogen can form pπ-pπ multiple bonds with itself. |
| 4. | Phosphorus, arsenic and antimony show catenation property. |
Subtopic: Group 15 - Preparation, Properties & Uses |
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Phenolphthalein is used as an indicator for the titration of sodium hydroxide solution against a standard solution of oxalic acid. The colour change that is observed at an alkaline pH close to the equivalence point during this titration is :
1. Pinkish red to yellow
2. Yellow to pinkish red
3. Colourless to pink
4. Pink to colourless
1. Pinkish red to yellow
2. Yellow to pinkish red
3. Colourless to pink
4. Pink to colourless
Subtopic: Detection of Anions | Detection of the functional groups |
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Match List-I with List-II:
Choose the correct answer from the options given below :
1. A-IV, B-I, C-III, D-II
2. A-III, B-IV, C-II, D-I
3. A-I, B-II, C-IV, D-III
4. A-II, B-III, C-I, D-IV
| List-I | List-II | ||
| A. | C2H4 | I. | 3 σ bonds, 2 π bonds |
| B. | C2H2 | II. | 3 σ bonds, one lone pair |
| C. | CH4 | III. | 4 σ bonds |
| D. | NH3 | IV. | 5 σ bonds, 1 π bond |
Choose the correct answer from the options given below :
1. A-IV, B-I, C-III, D-II
2. A-III, B-IV, C-II, D-I
3. A-I, B-II, C-IV, D-III
4. A-II, B-III, C-I, D-IV
Subtopic: Types of Chemical Bond | V.S.E.P.R & V.B.T |
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At a certain temperature, T(K), during a process, 500 J is absorbed by the system and work of 200 J is done by the system. Then change in internal energy of the system is :
1. 700 J
2. 300 J
3. 400 J
4. 500 J
1. 700 J
2. 300 J
3. 400 J
4. 500 J
Subtopic: First Law of Thermodynamics |
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