Question

Which is more stable ch3ch2 or (ch2)3 ch

Answer 1

Answer:

In carbanions , if there are more alkyl groups attached to the negative Carbon atom , the +I effect increases. Increased localisation of the –ve charge on a Carbon atom makes the species unstable. Hence CH3CH2-- is more stable than (CH3)2 CH--

Answer 2

Answer:

In this case CH3-CH2+ is more stable than (CH2)3CH. First I'll explain about CH3-CH2+ carbocation. The positive charge on the CH2 is stabilised by the inductive effect from the neighbouring carbon atom.

Coming to (CH2)3CH. The two carbon atoms involved are sp2 hybridised. An sp2 hybridised atom is averse to a positive charge and this aversion increases as the s-character of a hybridised carbon atom increases. Also the inductive effect decreases by the neighbouring carbon atom because that is also sp2 hybridised.