Arrange the following in the decreasing order of their melting points:
I. Heptane II. Octane
III. Nonane IV. Decane
IV > II > III > I
IV > III > I > II
I > II > IV > III
II > III > I > IV
Which of the following is not a cumulated diene?
Hexa - 2 , 3 - diene
Penta - 1 , 3 - diene
Hexa - 1 , 2 - diene
Penta - 2 , 3 - diene
In the eclipsed conformation of ethane, the dihedral angle between the hydrogen atoms of adjacent methyl groups is :
60°
120°
0°
180°
The major product of the addition of water molecule to propyne in the presence of mercuric sulphate and dilute sulphuric acid is :
ethanal
2-propanol
propane
propanone
Which of the following statements is not an essential feature of an optically active molecule ?
It will rotate the plane of polarised light
It will have a non-superimposable mirror image
It will have no element of symmetry
It will have an asymmetric carbon atom
D.
It will have an asymmetric carbon atom
Presence of an asymmetric carbon is not essential for optical activity.
The reagent which could distinguish between 1-hexyne and 1-hexene is :
Ag
KMnO4
Br2 in CCl4
H2SO4
Choose the correct reagent required to carry out the transformation :
Zn + conc. HCl
conc. H2SO4
Li then H2O
H2/Pt
The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25°C and it increases the temperature of 18.94 kg of water by 0.632°C. If the specific heat of water at 25°C is 0.998 cal/g-deg, the value of the heat of combustion of benzoic acid is
881.1 kcal
771.2 kcal
981.1 kcal
871.2 kcal