Benzene Structure and Intro

Q. The ratio of $\sigma$ and $\pi$ bonds in benzene is

1. 2
2. 6
3. 4
4. 8

Q. General formula of aldehyde is:

1. $C_n{H}_{2n}O$
2. $C_n{H}_{2n+1}O$
3. $C_n{H}_{2n}{O}_2$
4. $C_n{H}_{2n+2}O$

Q. The ratio of $\sigma$- to $\pi$-bonds in benzene is .

1. 2
2. 4
3. 6

Q. Borazole contains ______ bonds

1. 6 Sigma, 9 Pi
2. 9 Sigma, 6 Pi
3. 15 Sigma, 0 Pi
4. 12 Sigma, 3 Pi

Q. In benzyne, the triple bond consists of:

1. one $sp-sp$ sigma bond and two $p-p$ pi bonds
2. two $sp-sp$ sigma bonds and one $p-p$ pi bond
3. one ${sp}^2-{sp}^2$ sigma bond, one $p-p$ pi bond
4. one ${sp}^2-{sp}^2$ sigma bond, one ${sp}^2-{sp}^2$ pi bond and one $p-p$ pi bond

Q. When an inorganic compound (X) having 3c-2e as well as 2c-2e bonds reacts with ammonia gas at a certain temperature and gives a compound(Y) iso-structural with benzene.Compound (X) with ammonia at a high temperature, produces a hard substance (Z).Then:

1. X is $B_2{H}_6$
2. Z is known as inorganic graphite
3. Z having structure similar to X
4. Z having structure similar to graphite

Q. The bonds present in borazole or in inorganic benzene are :

1. $12\sigma ,3\pi$
2. $9\sigma ,6\pi$
3. $6\sigma ,6\pi$
4. $9\sigma ,9\pi$

Q. 1-Penten-4-yne reacts with bromine at $-{80}^{o}C$ to produce:

1. $4,4,5,5-tetrabromopentene$
2. $1,2-dibromo-1,4-pentadiene$
3. $1,1,2,2,4,5-hexabromopentene$
4. $4,5-dibromo-1-pentyne$

Q. In benzene all the C-C bond lengths are same.

1. True
2. False

Q. In benzene there are 3 pi bonds and 10 sigma bonds.

1. True
2. False