With respect to the conformers of ethane, which of the following statements is true?

(1) Bond angle remains same but bond length changes

(2) Bond angle changes but bond length remains same

(3) Both bond angle and bond length change

(4) Both bond angles and bond length remain same

The IUPAC name of the compound

is-

1. 3-Keto-2-methylhex-4-enal

2. 5-Formylhex-2-en-3-one

3. 5-Methyl-4-oxohex-2-en-5-al

4. 3-Keto-2-methylhex-5-enal

The correct order of acidity among the following is:

1. CH₂=CH₂ >CH≡CH > CH₃C≡CH > CH₃-CH₃

2. CH≡CH > CH₃-C≡CH > CH₂=CH₂ >CH₃-CH₃

3. CH≡CH > CH₂=CH₂ > CH₃-C≡CH > CH₃-CH₃

4. CH₃-CH₃ > CH₂=CH₂ > CH₃-C≡CH > CH≡CH

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

1. sublimation

2. chromatography

3. crystallisation

4. steam distillation

In pyrrole,

The electron density is maximum on

1. 2 and 3         2. 3 and 4

3. 2 and 4         4. 2 and 5

Which among the given molecules can exhibit tautomerisrn?

1. III Only
2. Both I and III
3. Both Iand II
4. Both II and III

The correct order of strengths of the carboxylic acids :-

(a) I>II>III
(b) II>III>I
(c) III>II>I
(d) lI>I>IlI

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is:

In Duma’s method for estimation of nitrogen, 0.25g of an organic compound gave 40 mL

of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension

at 300 K is 25 mm, the percentage of nitrogen in the compound is

1. 17.36

2. 18.20..

3. 16.76

4. 15.76

The compound that gives the most stable carbonium ion after C- Cl bond ionisation among the following  is-

1.		2.
3.		4.