The correct statement regarding electrophile is :
1. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile |
2. | Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile |
3. | Electrophiles can be either neutral or positively charged species and can form a bond accepting a pair of electrons from a nucleophile |
4. | Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile |
A gas is allowed to expand in a well-insulated container against a constant external pressure of 2.5atm from an initial volume of 2.50 L to a final volume of 4.50L. The change in internal energy U of the gas in joules will be:
1. –500J
2. –505J
3. –506J
4. –508J
Mark the correct reaction among the following to convert acetamide to methenamine:
1. Hoffmann bromamide reaction
2. Stephens reaction
3. Gabriels phthalimide synthesis
4. Carbylamine reaction
With respect to the conformers of ethane, which of the following statements is true?
1. | Bond angle changes but bond length remains the same |
2. | Both bond angle and bond length change |
3. | Both bond angle and bond length remain the same |
4. | Bond angle remains the same but the bond length changes |
In which pair of ions both the species contain S-S bond?
1.
2.
3.
4.
The correct statement among the following is :
1. | Sn2+ is an oxidizing agent while Pb4+ is a reducing agent. |
2. | Sn2+ and Pb2+ both are oxidizing agents. |
3. | Sn4+ is a reducing agent while Pb4+ is an oxidizing agent. |
4. | Sn2+ is a reducing agent while Pb4+ is an oxidizing agent. |
The correct increasing order for the wavelengths of absorption in complexes of Co3+ is:
1. [Co(H2O)6]3+ < [Co(en)3]3+ < [Co(NH3)6]3 +
2. [Co(H2O)6]3+ < [Co(NH3)6]3+ < [Co(en)3]3+
3. [Co(NH3)6]3+ < [Co(en)3]3+ < [Co(H2O)6]3+
4. [Co(en)3]3+ < [Co(NH3)6]3+ < [Co(H2O)6]3+
A, X, Y, and Z in the above-mentioned reaction are:
A | X | Y | Z | |
1. | Methoxy- methane |
Ethanol | Ethanoic acid | Semicarbazone |
2. | Ethanal | Ethanol | But - 2 - enal | semicarbazone |
3. | Ethanol | Acetaldehyde | Butanone | Hydrazone |
4. | Methoxy- methane |
Ethanoic acid | Acetate | Hydrazine |
Which product is generated when cyclohexanone undergoes
aldol condensation and is subsequently heated?
1. | 2. | ||
3. | 4. |
Which of the following pairs of species have the same bond order?
1.
2.
3.
2. CO, NO