A mixture of carbon monoxide and hydrogen is known as

X is the mother of L. C is the wife of L. D is the son of C. D has a sister named F. How is F related to L?

Which of the following letter-clusters will replace the question mark (?) in the given series?

YTM, AQQ, CNU, ?, GHC

By Interchanging the given two numbers (not digits) which of the following equation will be not correct? 

7 and 3 

Select the number from among the given options that can replace the question mark (?) in the following series.

1, 3, 7, 15, 31, 63, ?

Statements: Some lipsticks are foundation. All foundation is brown. Some brown are highlighters.

Conclusion I: Some lipsticks are brown.

Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

_ c _ d d _ c a _ c b d d b _ a

This question is based on the given words.

ELF PUT HOP JAB 

In a certain code language, 'CURD' is written as '342184' and 'BREAD' is written as '2181024'. How will 'BUTTER' be written in that language?

Select the set in which the numbers are related in the same way as are the numbers of the following sets.