The IUPAC name of the compound 

 

1. 5-formylhex-2-en-3-one

2. 5-methyl-4-2-en-5-el

3. 3-keto-2-methylhex-5-enal

4. 3-keto-2-methylhex-4-enal

The most suitable method of separation of 1:1 mixture of ortho and para-nitrophenols is:

1. Chomatography

2. Crystallization

3. Steam distillation

4. Sublimation

The hybridised state of C in $\stackrel{\oplus }{\mathrm{C}}{H}_5$ is 

1. $\mathrm{sp}$

2. ${\mathrm{sp}}^2$

3. ${\mathrm{sp}}^3$

4. ${\mathrm{sp}}^3\mathrm{d}$

Which alkene has smallest heat of hydrogenation ?

In  the decreasing order of bond length will be

1. I>II>III

2. II>III>I

3. III>II>I

4. II>I>III

The correct order of abstraction of hydrogen toward homolytic fission is:

1. 2 > 4 > 3 > 5 > 1

2. 4 > 2 > 5 > 3 > 1

3. 4 > 2 > 3 > 5 > 1

4. 4 > 3 > 2 > 5 > 1

In the above compound, at which bond proton $\left({\mathrm{H}}^{+}\right)$ attacks fastest ?

1. A

2. B

3. C

4. D

The most stable free radical is 

Consider the following carbocations 

The correct order of stability is 

1. II>III>I>IV

2. III>I>II>IV

3. III>I>IV>II

4. II>IV>I>III

Consider the following resonating structures of HCOOH

The order of stability is-