The carbocation among the following that doesn't get stabilized by resonance is :

1.		2.
3.		4.

The major contributor to the resonance hybrid among the following resonance structures is-

\(\underset{\left(\right. \mathbf{I} \left.\right)}{\left(CH\right)_{3} - \left(CH\right)_{2} - C \overset{\oplus}{H} - O_{\cdot \cdot}^{\cdot \cdot} \left(CH\right)_{3}   \underset{}{\leftrightarrow}}\)
\(\underset{\left(\right. \mathbf{II} \left.\right)}{  \left(CH\right)_{3} - \left(CH\right)_{2} - CH = O_{\cdot \cdot}^{\oplus} \left(CH\right)_{3}}\)

1.  I

2.  II

3.  Both have equal contribution

4.  They are not resonance structures

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

The correct statement regarding electrophile is :

The correct order with respect to –I effect of the substituents is:
(R = alkyl)

1. –NH₂ > –OR < –F
2. –NR₂ < –OR < –F
3. –NH₂ > –OR > –F
4. –NR₂ > –OR > –F

In Kjeldahl’s method for estimation of nitrogen present in the soil sample, ammonia evolved from 0.75g of sample neutralized 10ml. of 1M H₂SO₄. The percentage of nitrogen in the soil is:

The total number of resonating structures (excluded the given structure) formed by the given molecule are :

The most stable canonical structure among the given structures is/are :

The structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is:

1.		2.
3.		4.