Which of the following does not undergo Aldol condensation?
The geometry of paramagnetic nickel complex [NiCl₄]²⁻ is:
Out of Fe²⁺, Co²⁺, Cr³⁺, Ni²⁺, the one which shows the lowest magnetic moment is:[Atomic number: Fe = 26, Co = 27, Ni = 28, Cr = 24]
Assertion (A): The relation R = (x, y) : (x + y) is a prime number and x, y in N is not a reflexive relation. Reason (R): The number \( 2n \) is composite for all natural numbers \( n \).
It is known that 20% of the students in a school have above 90% attendance and 80% of the students are irregular. Past year results show that 80% of students who have above 90% attendance and 20% of irregular students get “A” grade in their annual examination. At the end of a year, a student is chosen at random from the school and is found to have an “A” grade. What is the probability that the student is irregular?