GivenKcal Kcal Kcal the heat of formation of methane in Kcal will be-

A set of (2n + 1) elements is given. The no. of subsets of the set which contain atmost n elements -

  under Hofmann conditions will give :

 Which step is rate determining ste

Which reagent (X) is used to convert I to II

An organic compound A upon reacting with NH₃ gives B. On heating B gives C. C in presence of KOH reacts with Br₂ to given CH₃CH₂NH₂ . A is :

If r, s, t are prime numbers and p, q are the positive integers such that the LCM of p, q is , then the number of ordered pair (p, q) is-

Be careful about selecting the r s and t for this particular problem. Because number ways for each selection of r, s and t there are 3 cases. Because there are two values given

A rectangle has sides of (2m – 1) & (2n – 1) units as shown in the figure composed of squares having edge length one unit then no. of rectangles which have odd unit length –

Observe the esterification mechanisms for primary and tertiary alcohols
Type-1:

Type-2: 
Mechanism: 

In the above reaction (P) and (Q) are respectively :

Two identical samples of a gas are allowed to expand (i) isothermally (ii) adiabatically work done is

A thermodynamic system is taken from state A to B along ACB and is brought back to Along BDA as Shown in the P$\to$V diagram. The net work done during the complete cycle is given by the area.

An ideal gas is taken V path ACBA as Shown in figure, The net work done in the whole cycle is

In the Cyclic Process shown is the figure, the work done by the gas in one cycle

A Cyclic process is Shown in the P$\to$T diagram. Which of the curve show the same process on a V$\to$T diagram?

The M.I of a disc of mass M and radius R about an axis passing through the centre O and perpendicular to the plane of dise is $\frac{{MR}^2}{2}$ If one quarter of the disc is removed the new moment of inertia of disc will be....