Substitution vs elimination

[anag]

Why do poor nucleophiles undergo no reaction with primary unhindered and primary branched haloalkane?

Why do 2°& 3°haloalkanes undergo only E2 reaction with strongly basic unhindered nucleophiles like RO-, OH-, R2N-, H2N-, LDA & Me3CO-? Please explain.

[DIKSHANT GAUTAM]

@anag
poor nucleophile undergoes no reaction as they are not much capable of breaking the bond and make the stable transition state....
in 2 and 3 degree reactants the stable products froms when treated with strong base..
you have to remember it as facts..