To get three images of a single object, we should have two plane mirrors at an angle of:
1. \(60^\circ\)
2. \(90^\circ\)
3. \(120^\circ\)
4. \(30^\circ\)

A particle of mass \(M\) and charge \(Q\) moving with velocity \(v\) describes a circular path of radius \(R\) when subjected to a uniform transverse magnetic field of induction \(B.\) The work done by the field, when the particle completes one full circle, is:
1. \(\frac{Mv^2}{R}2\pi R\)
2. zero
3. \(BQ2^{\pi R}\)
4. \(BQv2^{\pi R}\)

A particle of mass 100 g is thrown vertically upward with a speed of 5 m/s. The work done by the force of gravity during the time the particle goes up is:

1. -0.5J

2. -1.25J

3. 1.25J

4. 0.5J

The relative reactivity’s of acyl compound towards nucleophilic substitution are in the order of:

1. Acyl chloride > acid anhydride > ester > amide

2. Ester > acyl chloride > amide > acid anhydride

3. Acid anhydride > amide > ester > acyl chloride

4. Acyl chloride > ester > acid anhydride > amide

Clemmensen reduction of a ketone is carried out in the presence of which of the following?

1. Zn-Hg with HCl

2. LiAlH4

3. H2 and pt as catalyst

4. Glycol with KOH

In Duma’s method of estimation of nitrogen, 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be: (Aqueous tension at 300 K = 15 mm)

1. 16.45

2. 17.45

3. 14.45

4. 15.45

Which of the following is not correct?
 

Which one of the following is aromatic?

1. Cyclopentadienyl cation

2. Cyclooctatetraene

3. Cycloheptatriene

4. Cycloheptatrienylcation

The complexes [Co(NH₃ )₆ ] [Cr(CN)₆] and [Cr(NH₃ )₆ ] [Co(CN)₆ ] are the examples of which type of isomerism?

1. Ionization isomerism

2. Coordination isomerism

3. Geometrical isomerism

4. Linkage isomerism

A solution with negative deviation among the following is:

1. ethanol-acetone

2. chlorobenzene-bromobenzene

3. chloroform-acetone

4. benzene-toluene