Question

Carbonyl compound shows which
kind of electronic transition
*​

Answer 1

Answer:

Transition probability

It is not essential that exposure of a compound to ultraviolet or visible light must always gives to an electronic transition. On the other hand, the probability of a particular electronic transition has found to depend €d upon the value of molar extinction coefficient and certain other factors. According transitions can be divided into two categories.

(i) Allowed transitions

(ii) Forbidden transitions

(i) Allowed transitions – these are transitions having molar coefficient 104 or more. These are generally designated as π→ π transitions. For example in 1,3-butadiene which exhibits absorption at 217nm has €max value 21000 represents an allowed transition. These transition are mainly favoured due to symmetry relationship. For e.g.

1,3- butadiene absorbs at 217nm and has molar absorptivity of 21000

(ii) Forbidden transitions­ – these are transitions for which €max is generally less than 104 . for example transition of saturated aldehyde showing weak absorption near 290nm and having €max 100 has been a forbidden transition. For e.g.

Carbonyl group absorbs at 300nm and a molar absorptivity of 10-100.5

Explanation:

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