Chemistry Test 13

Result

Chemistry Test 13

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Weekly Quiz Competition

Question 1
4 / -1

Pick up the correct statement

A
+ I effect stabilizes carbocation

B
+ I effect stabilizes carbanion

C
- I effect stabilizes free radical

D
– I effect destabilizes carbanion

Solution

It is actual statement about inductive effect. +I effect increases the electron density and therefore, stabilises electron deficient species such as carbocation and free radicals, -I effect stabilises carbanion
Question 2
4 / -1

The correct order of melting points of isomeric pentanes is

A
n-Pentane > iso-Pentane > neo-Pentane

B
neo-Pentane > iso-Pentane > n-Pentane

C
neo-Pentane > n-Pentane > iso-Pentane

D
n-Pentane > neo-Pentane > iso-Pentane

Solution

neo-Pentane is spherical and packing of molecules in solid state will be best in this case. Hence contrary of having extra branching, it has the highest melting point. Next in symmetry and packing is n-pentane, and iso-pentane having unsymmetrical branch has least melting point