Explain why alkyl groups act as electron donors when attached to a `π` system.

Which of the following alkyl groups is more powerful electron donating group when they are attached to unsaturated carbon

Explain why chromium has only one electron in its 4s subshell?

Explain the hybridisation of carbon to which halogen atom is attached in alkyl halides, vinyl halides, aryl halides and aryl alkyl halides

When alkyl groups are attached to an unsaturated system or a benzene nucleus, the sigma electrons present in -underset(|)overset(|)(C )-H bond of the alkyl group also involve in conjugation known as hyperconjugation

Explain why the alkyl halides though polar are immiscible with water .

Explain why the valance electronic configuration of Cr andCu are written as 3d^5 4S^(1) and 3d^(10) 4s^(1) instead of 3d^4 4s^2 and 3d^9 4s^2 ?

Explain the role of electron withdrawing and electron releasing groups on the acidity of carboxylic acids.

What is the orientation effect of aldehydic and ketonic group when attached to aromatic ring towards electrophilic substitution reactions?

Explain why passengers are thrown forward from their seats when a speeding bus stops suddenly

Mesomerism is extended resonance. Atoms or groups with lone pairs of electrons release electrons when connected to doubly bonded carbons. It is +M effect. Unsaturated groups when connected to doubly bonded carbons withdraw pi electrons from the doubly bonded carbons. It is -M effect. Here the double bond is the unsaturated group should be between less electronegative atom and more electronegative atom. Which of the following is most stable?