1is the 2nd ans 10??
3 Answers
1these formulae might help
unsymmetrical molecule: meso forms=0,dl isomers-2^{n}
symmetrical with even no. of chiral atoms :meso2^{n/2-1}
dl:2^{n-1}
symmetrical with odd no. of carbon atoms-
meso2^{n/2-1/2}
dl:2^{n-1} -2^{n/2-1/2}