Which of the following compounds has the lowest boiling point?
C\(_4\)H\(_10\)
CH\(_3\)COOH
H\(_2\)O
C\(_2\)H\(_5\)OH
Correct answer is A
| COMPOUNDS | BOILING POINTS |
| Butane |
-1 °C |
| Ethanoic acid |
118 °C |
| Water |
100 °C |
| Ethanol |
78.37 °C |
The type of isomerism exhibited by cis and trans isomers is?
positional
geometrical
functional
optical
Correct answer is B
- Cis–trans isomerism, also known as geometric isomerism or configurational isomerism arises when atoms or groups are arranged differently in space due to restricted rotation of a bond or bonds in a molecule.
The following molecules have double covalent bonds between two atoms except?
oxygen
carbon (IV)oxide
ethene
water
Correct answer is D
In the case of water, hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond.
Which of the following solids would not decompose on heating?
Ammonium chloride
Lead (i) trioxonitrate (V)
Potassium trioxocarbonate (IV)
Sodium hydrogen trioxocarbonate (IV)
Correct answer is C
trioxoxcarbonates (iv) of Na & K are stable to heat
The boiling point of pentane is higher than that of propane because?
carbon-carbon single bonds are stronger than carbon-hydrogen bonds.
Pentane has more covalent bonds to break
Pentane does not burn easily as propane
The intermolecular forces in pentane are stronger than those of propane
Correct answer is B
The boiling points of alkanes increase with increasing number of carbons. This is because the intermolecular attractive forces, although individually weak, become cumulatively more significant as the number of atoms and electrons in the molecule increases.